Corp fin textbook lecture notes

Lecture Notes to Accompany
Brealey and Myers
Principles of Corporate Finance
by

Matthew Spiegel
Yale School of Management
Box 208200
New Haven, CT 06520-8200
matthew.spiegel@yale.edu

and

Richard Stanton
University of California, Berkeley
Haas School of Business
S545 Student Services Building, #1900
Berkeley, CA 94720-1900
stanton@haas.berkeley.edu

June 23, 2000

Table of Contents
An Introduction to the Language of this Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Foundations of the Present Value Formula . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

What is Present Value? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Time Varying Interest Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Perpetuities and Annuities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Stock Pricing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Alternative Measures of Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

The U.S. Tax Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Investment Decisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Mutually Exclusive Projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Cost of Excess Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Decision Making Under Uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Risk Premia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Statistics Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

The Capital Asset Pricing Model (CAPM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Portfolio Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Betas and Cash Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Calculating the Beta for a Set of Cash Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

The Efficient Markets Hypothesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

The Modigliani-Miller Theorem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

MM With Taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Capital Costs and Taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Options And Derivative Securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Options and the Underlying Stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Where Do We See Options? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Lecture 1: Introduction and Vocabulary

An Introduction to the Language of this Class
Definition: A project is anything that generates a series of cash flows.

Examples:
A. You start a bicycle repair shop. Cost $500. Expected earnings $1,000 per month starting next month for
24 months.

B. A company decides to sell purple pencil lead and expects to earn $10,000 per year for 10 years beginning
next year after an initial investment of $20,000.

C. An investor purchases a Certificate of Deposit (CD) from a bank for $10,000. The bank will repay
$12,000 in two years.

D. A lottery ticket that costs $1, and offers to pay $14,000,000 with some probability.

Projects can range from true physical investments (the bicycle repair shop), to pure monetary investments
(the CD), to gambles (the lottery ticket).

Whatever the source of the funds, finance only concerns itself with the actual cash flows.

A Firm
A firm or company invests in various projects.

These projects generate expenses, and produce revenues.

Revenues in excess of expenses go to either new investments, or to the firm’s security holders.

An Overview of Corporate Securities
Common stock (equity)
Cash Flows: Receives all corporate payouts, after every other claimant has been paid. Payments to the
equity holders are called dividends.

Larger firms have their common stock traded on a major stock exchange, like the New York Stock
Exchange. There investors can purchase and sell shares. Closing prices for the previous days trade
can be found in most newspapers.

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Tax Status:

Individuals
Dividends are taxed as “ordinary income” (just like wage income).

Capital Gains have historically been taxed at a rate below that of ordinary income. (A shareholder who
purchases a share of stock for $20, and sells it for $22, realizes a $2 capital gain.)

Company.
Payments to equity are not tax deductible from corporate profits.

Corporate Rights:
Can hire and fire management, its voting power allows its owners to control corporate decision making.

Preferred stock
Cash Flows:
The firm agrees to give the holder of this security a set dividend every period (for example $2.25 per calender
quarter per share).

1. Like common stock, preferred stock may be traded on a stock exchange. If it is traded
on an exchange, the newspaper will report the closing price.

Tax Status:
Same as common stock.

1. Very poor tax treatment. Payments resemble debt, but are not tax deductible by the firm.
Tax consequences to the individual are the same as with debt.

2. Due to tax treatment, preferred stock is only issued by regulated firms (i.e. public utilities
issue this security).

Corporate Rights:
Paid before common equity, but after all other claimants. Generally, cannot vote. If the company fails to
make a payment preferred stockholders cannot force any immediate action.
Contracts generally prevent common stockholders from receiving funds until missed payments are made up,
often with interest.

2


Corporate Debt (Bonds)
Cash Flows: First in line for payment. Contracts require a fixed coupon payment every 6 months. At
maturity the firm then pays $1000 which equals the face value of the bond.

Larger firms have their bonds traded on a major bond exchange, like the New York Bond Exchange.
There investors can purchase and sell bonds. Closing prices for the previous days trade can be found
in most newspapers. However, most bond transactions take place between brokers rather than on
an exchange.

Tax Status:

Individuals.
Coupon payments are taxed as “ordinary income” (just like wage income).

Capital Gains: The difference between what an investor pays for the bond and its price when sold. If the
investor holds the bond to maturity then the difference between the purchase price and the face amount is
considered a capital gain.

Company.
Payments to debt are tax deductible from corporate profits.

Corporate Rights:
If the firm misses a payment the bondholders have the right to force a bankruptcy proceeding. In principle
this allows them to take over the company.

Types of Debt
I. Maturity.

1. Funded, any debt repayable in more than one year.

2. Unfunded, debt repayable in less than one year.

II. Repayment provisions.

1. Sinking fund. The company contributes money to the fund which then repurchases the bonds.

2. Call options give the firm the right to repurchase the debt at a specified price. (Usually, cannot
do this for at least 5 years.)

3


III. Seniority.

A. Senior Debt: Paid prior to all other claimants.

B. Subordinated Debt: Paid after the senior debt holders.

C. Secured Debt: Can claim the asset used as security if payments are not satisfied. A lease
agreement is essentially the same as secured debt. The difference lies in which party
technically owns the asset. With secured debt the firm owns the asset, in a lease the bank
owns the asset.

IV. Rates.

A. Floating rate: the interest rate is tied to some variable in the economy. For example adjustable
rate mortgages may be set 2.5 points above the one year treasury bill rate.

B. Fixed rate: the interest rate is fixed throughout the life of the loan.

V. Default risk.

A. "Junk bonds": A low rated bond, with a high probability that the firm will not meet its
contractual repayment obligations.

B. Investment grade: A highly rated bond, low probability of default.

VI. A Hybrid Security.

Convertible bonds can be exchanged for stock at a specified price, at the lender's option.

VII. Placement.

A. Publicly placed debt is sold to the general public and traded in the open market.

B. Privately placed debt is purchased by large institutions and either not traded at all or traded only
among large institutions.

Derivatives
Definition: A derivative is any security whose value derives from another security.

There now exist a wide array of derivative securities. Below are a few of the more common types.

4


Call Options.

American: gives the holder the right to purchase one share at a fixed price at any time on or prior to some
date.

European: gives the holder the right to purchase one share at a fixed price at some date.

Terminology:

Strike Price: the price at which the option holder can purchase the stock.

Expiration Date: the final date at which the option can be used.

Exercising an Option: to use the option to purchase stock.

Warrant: A call option issued by a firm to either its employees or investors.

Put Options.

Same as a call option except that it gives the owner the right to sell one share at a fixed price.

On expiration how much is a call option worth?

Case 1: The strike price is greater than the price of the stock.

In this case the investor can obtain a share of the stock for less money by purchasing it in the open
market. So the option should not be exercised.

Option’s value = 0.

Case 2: The strike price is less than the price of the stock.

In this case exercising the option is less expensive than purchasing it in the open market. So the
option should be exercised.

Option’s value = Market Price of the Stock - Exercise Price.

5


The Value of a Call Option at Expiration

6


On expiration how much is a put option worth?

Case 1: The strike price is greater than the price of the stock.

In this case the investor can sell a share of the stock for more money by using the option. So the
option should be exercised.

Option’s value = Exercise Price - Market Price of the Stock.

Case 2: The strike price is less than the price of the stock.

In this case the investor can sell the stock for more in the open market. So the option should not be
exercised.

Option’s value = 0.

7


The Value of a Put Option at Expiration

8

Lecture 2: Present Value: Foundations

Foundations of the Present Value Formula
What do capital markets (such as banks, savings and loans, bond markets) do for the economy? To find the
answer consider what would happen if they all disappeared.

Here we see Mr. A prefers project 2, while Ms. B prefers project 1. Without knowing an investor's
consumption preferences, and absent a capital market, it is impossible to say one project is superior to
another.

9


Both investors prefer project 2 to project 1. Note, the budget constraint induced by project 2 intersects the
$ Today axis further to the right. The further to the right the intersection the higher the investor's welfare.
The point of intersection is called the Present Value of the project.

With a capital market all investors agree on the ranking of projects. The project with the highest
Present Value (PV) is best. Thus, if an investment advisor only knows each project's PV she can rank them
for her clients.

Consumption Shifting Example. Interest rate 10%.

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Consume All Today & Zero Next Period

PV(Project 1) = 3,000 + 20,000/1.1 = 21,182

PV(Project 2) = 8,000 + 8,000/1.1 = 15,272

Borrow 2,000

Project 1: Consume 5,000 today and 20,000 - 2,000×1.1 = 17,800 next period.

Project 2: Consume 10,000 today and 8,000 - 2,000×1.1 = 5,800 next period.

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Save 2,000

Project 1: Consume 1,000 today and 20,000 + 2,000×1.1 = 22,200 next period.

Project 2: Consume 6,000 today and 8,000 + 2,000×1.1 = 10,200 next period.

Save Everything

Project 1: Consume 0 today and 3,000×1.1 + 20,000 = 23,300 next period. The figure 23,300 is called the
Future Value of the project.

Project 2: Consume 0 today and 8,000×1.1 + 8,000 = 16,800 next period. The figure 16,800 is called the
Future Value of the project.

The Investor's Problem: An example.

Suppose an investor owns project 1 and has a utility function over consumption equal to U=X1X2, where X1
and X2 equal period 1 and 2 consumption levels.

How much will the individual consume in each period?

Goal: Maximize U.
Constraint:

X2 = (3,000-X1)(1.1) + 20,000.

Savings from period Period 2 cash
1, plus interest. flow.

Finding the solution: Use the constraint to eliminate X2 from the utility function, and then maximize with
respect to X1.

Maximize U = X1{(3000-X1)(1.1)+20000} with respect to X1.

Differentiate with respect to X1, and set the result equal to zero

(3000-X1)(1.1) + 20000 - 1.1X1 = 0.

Now solve for X1:

X1 = 10,591.

Given X1, the constraint now tells us what X2 equals,

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X2 = (3000 - 10591)(1.1) + 20000 = 11,650.

Notice that the investor maximizes his utility by borrowing 7,591, to finance period one consumption.

What happens if the investor only has project 2 available? In this case the constraint becomes

X2 = (8,000 - X1)(1.1) + 8,000.

Repeating the analysis shows that the optimal choices for X1 and X2 equal:

X1 = 7,636, and X2 = 8,400.

Since project 2 induces lower consumption levels in both periods the investor is worse off.

Choosing Among Many Projects: You have $1,000 in the bank, and a corn farm. Each row of corn costs
$200 to seed, and there are 5 rows. The payoff for each row is listed below:

Row: A 50, B 600, C 400, D 200, E 100

Plot the tradeoff between money today, and money tomorrow.

13


14


In general the investment opportunity curve has the following shape.

The investment opportunity curve reflects the firm's ability to trade off dividends today (via forgone
investment) for dividends tomorrow.

Why is the curve concave? Start all the way to the right. The first dollar invested goes into the best project.
Suppose it returns $2. The second dollar goes into the second best project, returning $1.99. The third goes
into the third best project returning only $1.98, etc. Continuing on, the curve gets flatter and flatter as you
go to the left.

15


The graph displays three typical projects that are available to the firm on the investment opportunity curve.
If either project X or Y is selected, then the investor can consume along the dashed line by accessing the
capital markets. If project Z is selected then consumption can take place along the solid line. Project Z is
the optimal project. The principle that investors want the project with the highest PV continues to hold.

16


The difference between the "Total $ for Investment" and the "Dividend Paid Today" points, equals the
amount invested. Which is displayed on the next graph.

17


The optimal investment level occurs when the slope of investment opportunity curve equals -(1+r), where
r is the interest rate.

Notice that the PV of the firm under an optimal investment policy exceeds the amount of money it has
available to invest today.

18

Lecture 3: The Present Value Formula

What is Present Value?
Given a set of cash flow C0, C1, C2, ... PV is the amount you can have today if you borrow fully against all
the cash flows. Thus, the bank gives you PV today, you agree to turn over the cash flows C0, C1, C2, ...

Let Ct represent a cash flow arriving in year t and r the interest rate. Then

Example: C0=2, C1=7, C2=8, and r=.09

How to calculate PVs with the HP-12C

Step 1: Clear all registers.
Step 2: Enter data.

{2}[g][CF0] (Enters the period 0 cash flow)
{7}[g][CFj] (Enters the period 1 cash flow)
{8}[g][CFj] (Enters the period 2 cash flow)
{9}[i] (Enters the interest rate)
[f][NPV] (Asks for the answer)

Second example: C0=-90, C1=150, C2=0, C3=275 and r=.09
How to calculate this with the HP-12C

{90}[CHS][g][CF0]
{150}[g][CFj]
{0} [g][CFj]
{275}[g][CFj]
{9}[i]
[f][NPV] = answer

19


Third example: The Lottery.

You know that the odds of winning the lottery is 13 million to 1. Walking by the news stand you see a big
sign "JACKPOT 20 MILLION!!1" Should you invest $1 for a ticket?

Looking on the back of the ticket you notice the footnote. Then remembering what you learned in your
finance course you begin calculating the present value of the payoff. A quick examination of the Wall Street
Journal shows that the appropriate interest rate is 8 percent. Next you recall, that unfortunately when you
win so does the federal government (ie. the winnings are taxable). So you can only expect to keep 70 percent
of the payoff each year.

In net here is the problem, you have one chance in 13 million of winning a 20 year cash flow equal to (After
Tax Rate)(Payoff)/(Years) = .7(20,000,000)/20=700,000. Plugging this into the HP-12C yields: 6,872,703.
(Assuming of course you are the only winner, otherwise you split the jackpot. With odds like these you are
literally better off putting your money on #16 at a Reno roulette wheel.)

Entering the information in the HP-12C:

{20}[n] 20 years.
{8}[i] 8 percent interest rate.
{700000}[PMT] Annual payment.
{0}[FV] No future value.
[PV] Get the answer.

Note, the calculator gives a negative answer since it views the PMT, as a cash outflow. Enter
{700000}[CHS][PMT] to get a positive answer.

What is an interest rate?

Definition: Suppose rn represents an n period interest rate. Then an agent investing C dollars, will have at
the end of n periods C(1+rn) dollars.

Only numbers that meet the above definition are interest rates.

1
Paid in 20 annual equal installments.

20


Compounding: How to go from short periods to long periods.
Example A: The 1 month interest rate is 1%. What is the 1 year rate?

There are 12 months in 1 year.

=

Interest received Interest received
after 12 months after 1 year
in the bank. in the bank.

ryearly = .1268


{1.01}[ENTER] Places 1.01 in memory.
{12}[yx] Takes 1.01 to the 12th.

Example B: The 1 day rate is .2%. What is the weekly rate?

There are 7 days in a week.

(1.002)7 = (1+rweekly)

after 7 days after 1 week

rweekly = .014

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How to go from long periods to short periods.
Example A: The annual interest rate is 14%. What is the daily rate?

In 1 year there are 365 days.

1.14 = (1+rdaily)365

after 1 year after 365 days

rdaily = .000359


{1.14}[ENTER]
{365}[1/x][yx]

Example B: The monthly (month of February) interest rate is 1.5%. What is the weekly rate?

In 1 month there are 4 weeks.

1.015 = (1+rweekly)4

after 1 month after 4 weeks

rweekly = .003729

What they say at banks.

Sign in the window reads:

Interest rate: 8% compounded daily.

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Effective annual yield: 8.33%.

How the bank calculates your daily balance: Each day they multiply your balance by

1 + .08/365

Thus, over 1 year you earn

times your initial investment.

Question: Is 8% an annual interest rate?
Answer: NO! If 8% was an annual interest rate, then placing $100 in the bank for 1 year should produce
100(1.08) = 108 dollars. Instead, you earn

Question: Is the "effective annual yield" an interest rate?
Answer: YES!

Question: What is the daily interest rate?
Answer: .08/365

What they say at six month treasury auctions.

At a treasury auction, they sell bills that pay $10,000 in 180 days. If the quoted discount rate is 10%, then
it means you can purchase the bill at the auction for $9,500.

Price of the bill =
100(100 - (days to maturity/360)discount rate).

9,500 = 100(100 - (180/360)10)

Note t-bills are quoted in units of 100. So the actual quote will be

95 = 100 - (180/360)10.

Question: Is 10% an true interest rate?
Answer: No. If 10% is a true annual interest rate then placing $10,000 into t-bills for one year should leave
you with $11,000. In fact you earn (10,000/9,500)210,000 = $11,080.

23


The actual 6 month interest rate is (ignoring the fact that there are 365 and not 360 days in a year):

9,500(1+r6 month) = 10,000

r6 month = .0526.

So the annual interest rate equals,

1 + rannual = (1+r6 month)2 = 1.108.

This means the true interest rate is slightly higher than the quoted discount rate.

An example drawn from an actual automobile loan agreement.

The advertisement says 12 month car loans. Only 9%!

How they calculate the payments on a $10,000 car.

A 12 month $10,000 loan, at 9% implies that you owe $10,900. Twelve equal payments come out to
10,900/12 = 908.33 per month.

What is the actual interest rate on the loan?

The true interest rate must set the present value of the payments equal to the initial loan.

Therefore rmonthly=1.35%, and the annual interest rate rannual = (1+rmonthly)12-1 = 17.5% percent per year!

How to find these numbers on your calculator.

{10000}[CHS][g][CF0] Loan amount.
{908.33}[g][CFj] Payments.
{12}[g][Nj] Number of payments.
[f][IRR] Calculate 1 mo. rate.

(Note that the 1.35 is a percentage)

Why is the actual interest rate so high?

Each month you pay off part of the principal, thereby borrowing less later in the year. Yet the interest rate

24


calculated by the dealer assumes that you borrow all $10,000 for the whole year.

A true loan with a 9% annual interest rate comes out to 12 monthly payments of $872.89.

How to find the monthly payments. If the annual interest rate equals 9%, then monthly rate equals (1.09)1/12
= 1+rmonthly, rmonthly = .0072073. The monthly payment therefore solves:

Using your calculator:

{10000}[CHS][PV] Loan.
{.72073}[i] Monthly rate.
{12}[n] Number of payments.
{0}[FV] No balloon payment.
[PMT] Calc. mo. payment.

25

Lecture 4: Discounting Under Time Varying Interest Rates

Discounting When the Interest Rate Changes Over Time.
Let ft represent the interest rate in period t. This is called the year t forward rate. (Note: the text book talks
about spot rates, ft as defined here is a forward rate.)

Question: How much does a person earn after leaving C in the bank for 1 year?

Answer: C(1+f1)

Question: How much does a person earn after leaving C in the bank for 2 years?

Answer: C(1+f1)(1+f2)

Earnings after Interest rate
×
1 year. on the 2nd year

Question: How much does a person earn after leaving C in the bank for 3 years?

Answer: C(1+f1)(1+f2)(1+f3)

Earnings after Interest rate
×
2 years. on the 3rd year

Based upon what a person can earn by placing his money in a bank one can conclude that the PV formula
is:

Example: C0=10, C1=11, C2=12, f1=.14, f2=.15

26


Spot rates vs. forward rates:
The text gives the following PV formula when the interest rate varies over time. (rt = the year t spot rate.)

What is a spot rate?
A t year spot rate is the rate you earn on an annual basis when you leave your money in the bank for t years.

How do spot rates relate to forward rates?
1+f1 = 1+r1

(1+f1)(1+f2) = (1+r2)2

(1+f1)(1+f2)(1+f3) = (1+r3)3

So the t year spot rate is the geometric mean of the year 1 through t forward rates.

Examples:

1. Using forward rates to calculate spot rates.

If f1=.14, f2=.15, f3=.10, then

r1 = .14

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2. Using spot rates to calculate forward rates.

If r1=.05, r2=.08, r3=.11, then:

Solving for f1,

f1 = .05

Solving for f2,

1.05(1+f2) = 1.082 = 1.1664

f2 = .1109

Solving for f3,

(1.05)(1.1109)(1+f3) = 1.113 = 1.3676

f3 = .1725

Calculating forward and spot rates from bond prices:
In the real world no one gives you the forward rates, you must estimate them. In an efficient market the price
of an object equals its present value. So bond prices equal the present value from the bond's cash flows.

How a bond works: A bond has coupons and a face value. The coupons pay off every 6 months for a certain
number of years. After all the coupons are paid off the bond is redeemed for its face value.

For example, consider a 10 year bond with a face value of 1000 and 10% coupons. This bond has twenty
coupons, each of which pays 50. After 10 years the company redeems the bond for 1000. (Note: 10% is not
a true interest rate! Assuming the bond sells for 1000, what is the true interest rate?)

28


Bond example:

Mat. Period Mat. Value Coupon Price Name

1 1,000 100 1,000.00 A
2 1,200 60 1,086.49 B
3 800 160 1,004.50 C
4 1,500 50 1,233.21 D
11 300 0 20.00 E
12 10,000 0 512.828 F

Goal: find f1, then f2, then f3, then f4 and finally f12 as well as r1, r2, r3, r4, and r11 and r12.

Note: We are finding 6 month forward and spot rates.

Answers:

f1 = .1 r1 = .1
f2 = .11 r2 = .105
f3 = .08 r3 = .0966
f4 = .06 r4 = .087
f12 = .3 r11 = .27914 and r12 = .28086

How to find f1:

PV = 1000 C1 = 1100

so 1+f1 = 1100/1000 = 1.1

f1 = .1

Since r1 = f1, one has r1 = .1.

29


How to find f2:

PV = 1086.49 C1 = 60 C2 = 1260

Solving for f2 produces f2 = .11. Use 1+r2 = [(1+f1)(1+f2)]½ to get, r2 = .105.

To find f3 and f4 as well as r3 and r4 repeat the procedure given above.

To find f12 you must take advantage of the fact that bonds E and F are zero coupon bonds.

Bond E:

PV = 20, C1=C2=C3=...=C10=0 and C11=300

This allows us to write:

(1+f1)(1+f2)...(1+f11) = 15.

Since (1+r11)11 = (1+f1)(1+f2)...(1+f11) this must mean (1+r11)11 = 15, or r11 = .27914.

Lesson: You can read spot rates right off of a zero coupon bond!

30


Bond F:

PV = 512.82 C1=C2=....=C11=0

C12=10,000

Now use (1+f1)(1+f2)...(1+f11)=15 to get

Solving for f12 gives f12=.3.

As for r12, one can again read it right off of the bond’s price and promised payment using
(1+r12)12 = (1+f1)(1+f2)...(1+f12) = 19.5, or r12 = .28086.

Calculating Spot Rates When Bonds Payoff on Fractional Dates

Problem: It is now April 1, and you want to calculate monthly spot rates. You have the following bonds
available, each of which has one payment remaining

Date Payment Price
April 15 104 99.8
May 15 103 98.7
June 15 106 100.3

What are the monthly spot rates you can calculate?

Answer: You can calculate monthly rates for r0.5, r1.5, and r2.5. Fractional dates are allowed.

99.8 = 104/(1+r0.5)0.5 or r0.5 = .0208

98.7 = 103/(1+r1.5)1.5 or r1.5 = .0288

100.3 = 106/(1+r2.5)2.5 or r2.5 = .2236.

31


A Bond’s Yield to Maturity.
Newspapers and other public sources will frequently refer to a bond’s yield to maturity (YTM). The YTM
solves the following equation for y

where the C’s represent the cash payments from the bond. Some of you may recognize that the YTM equals
the internal rate of return (IRR) for a bond. Later, the course will discuss the IRR concept in more detail.

The YTM represents the return to an investor that purchases the bond today and holds it until maturity.
However, the YTM is not an interest rate. It does not satisfy the definition for either a spot or a forward rate.
Instead the YTM represents a complex mixture of the spot rates, a mixture that depends upon the size of the
coupon payments and the number of periods until maturity.

Real interest rates, nominal interest rates and inflation.
A nominal cash flow is simply the number of dollars you pay out or receive. A real cash flow is adjusted
for inflation. A real dollar always has the same purchasing power. One real dollar today equals one nominal
dollar today.

For example: You have $100, which you invest for 1 year at 10%. Bread sells for $2.00 today. Inflation
over the next year equals 4%.

Next year you receive from the bank 110 nominal dollars. Your nominal return equals 10%.

Next year one loaf of bread costs $2.08, so you can purchase 110/2.08 = 52.88 loaves of bread.
In real terms you begin with 50 loaves of bread, and earn an additional 2.88 loaves of bread. So in real terms
your return equals 2.88/50 = 5.77%.

In real dollars you begin with 100, earn a return of 5.77%, and thus finish with 105.77 real dollars.

Note that (1 + real rate)(1 + inflation rate) = (1 + nominal rate), (1.0577)( 1.04) = 1.10.

Rules:

1. Always discount real cash flows with the real interest rate.

2. Always discount nominal cash flows with the nominal interest rate.

32


The relationship between real interest rates, nominal interest rates and the inflation rate:

Let r = nominal interest rate, rreal = real interest rate, i = inflation rate.

This is incorrect: rreal + i = r

What is correct:

To get PV of C1 using the real interest rate, first requires you to convert period 1 dollars into period 0 dollars
(real dollars) and then discount using the real rate.

Step 1: Convert nominal dollars to real dollars

C1 real = C1/(1+i)

Step 2: Discount at the real rate of interest

PV = C1 real/(1+rreal)

Combining steps 1 and 2 gives the following present value formula:

PV = C1/(1+i)(1+rreal)

So what is the relationship between the real rate, the nominal rate, and the inflation rate?

(1+i)(1+rreal) = 1+r

Discounting with Discounting with
the real rate the nominal rate.
and the inflation
rate.

Some algebra produces: rreal + i + rreali = r.

It is often useful to rearrange this formula so that rreal = (r-i)/(1+i).

If i is close to zero, r - i will roughly approximate the real interest rate.

Examples: If the nominal interest rate equals .12, and the inflation rate is .05 what is the real interest rate?

rreal = (.12 - .05)/1.05 = .0667

33


Mistakenly using rreal = r - i produces a "real" interest rate of .07, a difference of one-third of a percent!

Example: For periods 1 to 3, the nominal interest rate equals .12, and the inflation rate equals .08. You have
a project that costs 100 in period zero. In period 1, you expect the project to yield a cash flow of 50. After
that, the cash flow grows with inflation in periods 2 and 3. How much is the project worth?

Solution 1: Convert to real rates, and discount real dollars.

rreal = (.12 - .08)/(1.08) = .037037.

What are the real cash flows? The -100 period zero outflow is a real cash flow. How about the 50 in period
1? No! The 50 in period 1 includes an inflation premium of 8 percent. The real cash flow in period 1 is
50/1.08 = 46.296. Since the profits keep up with inflation, you have a real cash flow of 46.296 in periods
1 through 3.

PV = -100 + 46.296/1.037 + 46.296/(1.037)2 + 46.296/(1.037)3 = 29.20.

Solution 2: Use the nominal rate, and discount nominal dollars.

As given in the problem: r = .12.

The nominal cash flows are: C0 = -100, C1 = 50, C2 = 50(1.08) = 54, C3 = 54(1.08) = 58.32.

Therefore,

PV = -100 + 50/1.12 + 54/(1.12)2 + 58.32/(1.12)3 = 29.20.

Notice that both solution methods produce the same answers.

Lesson: It does not matter if you use real rates and real cash flows, or nominal rates and nominal cash
flows. The only requirement is that you are consistent.

34

Lecture 5: Perpetuities and Annuities

Perpetuities and Annuities
Perpetuity
A perpetuity is a financial instrument that pays C dollars per period, forever. If the interest rate is constant
and the first payment from the perpetuity arrives in period 1, then the PV of the perpetuity is:

A growing perpetuity pays C(1+g)t-1 per year. For example, if C=100 and g=.1 then you will receive the
following payments:

C1 = 100

C2 = 100(1.1) = 110

C3 = 100(1.1)2 = 121

C4 = 100(1.1)3 = 133.1

The PV of a growing perpetuity is:

Notice that the growth term acts like a reduction in the interest rate.

Annuity
An annuity is a financial instrument that pays C dollars for T years. It has the following PV formula:

Easier method: Use the HP-12C

35


Example: Consider an annuity that pays 50 per year for 20 years. If the interest rate is 8%, what is the PV?

Answer: 490.9

How to enter the problem into the HP-12C

{20}[n] Enters the number of periods
{8}[i] Enters the interest rate
{50}[PMT] Enters the payments
{0}[FV] Enters a zero future value for the annuity (this is like a bond having a zero face
value)
[PV] Calculates the answer
Note: The calculator displays -490.9 because it considers PMT to be an outflow. Enter {-50} if you want
the HP to display a positive number.

Example: Mortgage Loan
To buy a house you take out a $120,000 fixed rate mortgage with 30 years to maturity, 360 equal monthly
payments, and a quoted interest rate of 9%. How much do you pay each month?

The mortgage is an annuity with 360 monthly payments, starting one month from today. Since payments are
monthly, we need the monthly interest rate.

The monthly rate on a mortgage is always the quoted rate divided by 12.
So the monthly interest rate, rm, is 0.09 / 12 = 0.0075 (or 0.75% per month).

Key fact: The remaining balance on a loan at any time equals the present value of the remaining payments,
calculated using the loan’s interest rate to do all discounting

Since the loan has just been taken out, the remaining balance today must equal the full $120,000 borrowed,
i.e.

120,000 = C/1.0075 + C/(1.0075)2 + ... + C/(1.0075)360

Solving for the monthly payment, C, we find that C = $965.55

Example: Mortgage Loan continued
Of the first month’s payment, how much is interest and how much is principal? What is the balance
remaining on the loan after 3 months? After 10 years?

The monthly interest rate is 0.75%, so the amount of interest due at the end of the first month is
0.0075 x 120,000 = $900.00

36


Since $900 of the first payment of $965.55 goes to paying interest, the remaining 965.55 - 900 = $65.55 goes
to paying off some of the remaining principal on the loan, so the balance on the loan at the end of one month,
after making the first payment, is
$120,000 - 65.55 = $119,934.55

What about month 2? Interest charged during month 2 is $119,934.55 x 0.0075 = $899.51. So $899.51 of
month 2's payments goes to paying interest, and the remaining $965.55 - 899.51 = $66.04 goes to paying off
principal, so the balance remaining on the loan after the month 2 payment is
$119,934.55 - 66.04 = $119,868.41

The balance remaining immediately before the month 2 payment is made is
$119,934.55 + $899.51 = $119,934.55 x (1.0075)
= $120,833.96

Now month 3:
Interest = $119,868.41 x 0.0075 = $899.01
So principal = $965.55 - 899.01 = $66.54
Remaining balance = $119,868.41 - 66.54 = $119,801.88

For year 10, we could continue like this for 120 periods. A simpler method is to remember that the remaining
balance always equals the present value of the remaining payments, calculated using the loan’s interest rate
to do all discounting.

After 10 years (120 months) there are 360 - 120 = 240 payments remaining. So

BAL120 = 965.55/1.0075 + 965.55/(1.0075)2 + ... + 965.55/(1.0075)240 = $107,315.69.

Growing Annuity
A growing annuity pays C(1+g)t-1 per year starting in period 1 for T periods. Its present value is given by

If you do not wish to memorize the growing annuity formula the following “trick” can be used instead. The
superscripts associated with the (1+g) term and the (1+r) term differ by one period. If they matched you
could treat (1+g)/(1+r) as an “interest rate” and then use the standard annuity formula or your calculator.

Pull out a (1+g)-1 term to produce

37


Let 1/(1+r*) = (1+g)/(1+r) and substitute this into the equation given above,

You can now use your calculator to find the PV. Simply use r* for your interest rate, where
r* = (1+r)/(1+g)-1.

Growing annuity example.

You have an annuity that pays 100 in period 1. The annuity grows at a rate of 6% per year, and pays off until
and including period 10. If the discount rate equals 8% what is the present value?

r* = (1.08)/(1.06) - 1 = .0189

Growing Annuity Begining at a Future Date:
If a T period annuity has its first payment (C) arrive in period -, then its value equals

Example: An insurance company offers a retirement annuity that pays 100 per year for 15 years and sells
for 806.07. What is the interest rate?

Solving for r gives the yield to maturity. Answer: r = .09

How to find r with the HP-12C

{806.07}[CHS][PV] Cost of the annuity
{100}[PMT] Payments
{15}[n] Number of payments

38


[i] Finds interest rate

Example: The retirement problem.
You are 25 years old. You will retire at the age of 65, and die when you are 90. Your goal is to have
$50,000, in today's dollars, a year to spend during your final years. (ie. You need $50,000 in your 66th year,
through and including your 90th year.) Beginning next year, you will save a fixed amount, in today's dollars,
every year until retirement. If the return on your investments equals 12%, and the inflation rate equals 8%,
how much do you need to invest each year?

Since the problem is couched in terms of real dollars, it is easier to use real interest rates.
As always rreal = real interest rate, r = nominal interest rate, and i = inflation rate.

From our formula: rreal + i +rreali = r.
rreal = (.12-.08)/1.08 = .037.

To answer the question, consider the problem from your perspective at age 65. You want an annuity that
pays $50,000 per year starting in one year, and that lasts 25 periods. What is its present value when you are
65.

PV(when you are 65)
= 50,000/1.037 + ... + 50,000/(1.037)25
= 806,473.

This means you must have saved $806,473 in real dollars by the time you reach 65.

Now what is the present value of the annuity today? You are 65 in period 40, so the PV of the annuity equals
806,473/(1.037)40 = 188,556.

Goal: Find constant payments (C) that satisfy the following equation.

188,556 =
C/1.037 + C/(1.037)2 + ... + C/(1.037)40

Using a calculator to solve for C yields:

C = 9,105.

So you need to put away $9,105 per year, every year until you retire. Good luck!

Solving for C on the HP-12C.

{188556}[CHS][PV] Present value.

39


{40}[n] # of payments.

{3.7}[i] Interest rate.

{0}[FV] Zero future value.

[PMT] Find C.

40

Lecture 6: Stock Pricing

Stock Pricing
Define:

DIVt as the dividend in year t.

Pt as the price in year t.

Then the price of a stock today (period zero) is:

One can rearrange the above equation to solve for r:

In this case r is called the market capitalization rate. It is the expected return on a firm's equity.

Why there is no such thing as an investor with a short term horizon.
(Or why all investors are long term investors.)

Given r, what is the stock's value in period 0?

In order to calculate P0 we now need to find P1. How is P1 determined? In a manner similar to P0:

Now plug the formula for P1 into the formula for P0 to get

41


New problem. How is P2 determined? Well, P2 is determined in a manner similar to P0 and P1.

Given the formula for P2, we can now plug it into our formula for P0 to get

Continuing through time, one eventually obtains:

What this implies is that every investor is concerned not only with short term profits, but the present value
of the entire series of dividends. This holds no matter how long (or short) a person expects to hold a
security!

Using the perpetuity and annuity formulas to price stocks.
Example: The Gizmo Company has strong short term growth prospects. In period 1, it will pay a dividend
of $5 per share, and the dividend will grow at a rate of 10% per period until the period 5 dividend. After that
no further growth is expected. If the market discounts the dividend stream at 15%, how much is a share
worth?

The stock's value consists of two parts. Part one is a growing annuity in periods 1 through 5. Part two is a
perpetuity, whose first payment occurs in period 6.

Growing Annuity:

In principle you can enter all this into your calculator and get the answer. This is very time consuming.
Alternatively we know an explicit formula. However, if you do not want to remember the formula, the
following is a useful trick.

42


First, pull out a 1/1.1 to get

Now, 1.1/1.15 = 1/{1.15/1.1} = 1/1.045. So the part in brackets reduces to a 5 year annuity, with a $5 per
period payment, discounted at 4.5%. Entering this information into your calculator yields:

PV(annuity) = 21.92/1.1 = 19.93.

Check that the formula gives the same answer.

Perpetuity: The perpetuity part pays 5(1.1)4=7.32, beginning in year 6.

To calculate the value of the perpetuity first consider how much it will be worth in year 5.

If Sam buys the perpetuity in period 5, from his perspective the first payment occurs one period later. So,

43


in period 5, Sam will pay 7.32/.15 = 48.80 for the perpetuity.

If Sam buys the stock for 48.80, in period 5, what is the perpetuity worth today? Answer: 48.80/(1.15)5 =
24.26.

The stock's value today equals:

PV(annuity) + PV(perpetuity) =
19.93 + 24.26 = 44.19.

Simple dividend growth model of stock prices:
Assume a stock's dividend will grow at a rate g. Then using the perpetuity formula the stock's price today
can be expressed as:

P0 = DIV1/(r - g)

In real life you know P0, DIV1 and can sometimes estimate g. When this occurs you can rearrange the above
equation to produce an expression for the market capitalization rate.

r = DIV1/P0 + g

This is a simple way to estimate r.

Example: Stock ABC will pay a dividend of $2 per share next period. The dividend grows at 3% a year and
presently the stock sells for $20. What is the market capitalization rate?

r = 2/20 + .03 = .13

The next issue is how to estimate g. A crude method is to use the following model.

Assume that every year a firm pays out a constant percentage of its earnings and invests the rest. In addition,
assume the return on equity is constant through time.

Step 1: Estimate the "plowback" and "payout" ratios. The plowback ratio is the percentage of the company's
profits that are reinvested every year. The payout ratio is the percentage of the firm's profits that are returned
to the investors every year.

Define EPSt as the firm's earnings per share in year t. Then

Plowback ratio = 1 - Payout ratio

44


= 1 - DIV1/EPS1

Step 2: Estimate the return on equity (ROE)

ROE = EPS1/Book Value Per Share

Step 3: Calculate g, where the dividend growth rate is estimated by

g = Plowback ratio × ROE

Warning: The above formulas require that the Plowback ratio, ROE, and the discount rate remain constant
forever. If they do not, the formula will not necessarily provide accurate estimates. Read questions carefully
to ensure the conditions for the formulas are met before trying to find an answer.

Example: ABC Co. has earnings per share of $10. It pays a $2 dividend and has a book value per share of
$100. What is g?

Plowback ratio = 1 - 2/10 = .8

ROE = 10/100 = .1

g = .8 X .1 = .08

Example: At present DEF Co. will pay an $8 dividend per share on earnings per share of $10. Its present
book value per share equals $100. Using the perpetual growth model described above, the market values the
stock at $110. The firm now discovers a new investment opportunity, with the same return as its previous
projects. It therefore alters its plowback ratio, and as a result next period's dividend falls to $6. What will
the stock sell for?

To answer questions like this begin with a list of what you know.

Dividend $8
Earnings $10
Book value $100
Stock price $110

Now ask yourself what is missing? In this case it is the plowback ratio, return on equity, the growth rate, and
the discount rate.

45


Plowback ratio = 1 - dividend/earnings = .2

ROE = Earnings/Book value = .10

g = Plowback ratio × ROE = .2 × .10 = .02

r = DIV1/P0 + g = 8/110 + .02 = .0927

You now know everything there is to know about the firm.

To answer the question we need to calculate how the factors in the model change.

Plowback ratio = 1 - 6/10 = .4

What is the ROE after the new investment policy? The question states that the return on the new project
equals the return on the previous projects. Is this important? Why?

Because the ROE on the new projects equals that on the previous projects we can continue to use ROE =
Earnings/Book = .1 in our calculations. If the new projects have a different ROE, then as time goes on the
firm's ROE changes, and we cannot use our formulas.

g = .4 × .1 = .04

P0 = DIV1/(r-g) = 6/(.0927-.04) = 113.85

Notice the stock price has gone up 3.85. Why? Because the cost of capital is only 9.27%, but the new
investment returns 10%. This leads to a gain for the shareholders.

Which of the following firms is worth the most if the market capitalization rate is 10%?

Firm A: Book = 100, EPS1 = 10, DIV1 = 10, Plowback ratio = 0, ROE = 10/100, g = 0

Firm B: Book = 100, EPS1 = 10, DIV1 = 6, Plowback ratio = 4/10, ROE = 10/100, g = 4/100

Firm C: Book = 150, EPS1 = 10, DIV1 = 2, Plowback ratio = 8/10, ROE = 10/150,
g = 5.33/100

Notice: For firm A the first dividend is the highest but the growth rate is the lowest, while firm C has the

46


lowest initial dividend but the highest growth rate.

Using our formulas P0 = DIV1/(r-g) and g = Plowback ratio × ROE we get

P0(A) = 10/.1 = 100

P0(B) = 6/(.1 - .04) = 100

P0(C) = 2/(.1 - .053) = 42.6

So firm A and B have the same value, while firm C is worth the least. Why?

For firms A and B the ROE is the same as the market capitalization rate. Thus, all their investments have
a NPV of zero. That is a one dollar investment gives back one dollar in value. Lesson: Investing in zero
net present value projects cannot change a firm's value!

Why does firm C have the lowest value?

Because its investments have NEGATIVE NPVs. The firm invests in projects which return only .066 per year
yet the cash flows are discounted at .1 per year. Every dollar they invest pays only 66 cents in present value!
(To see this figure out what .066 per year forever is worth and compare this to the 1 dollar you must invest
to receive it.)

PVGO: Present Value of Growth Opportunities

Consider the following firm:
EPS1 = 10 and r = .1

Suppose DIV1=10, then the Plowback ratio = 0 and thus one expects EPS2=10. Without any new investment
earnings should not change. Now suppose DIV2=10, then EPS3=10 etc. Thus, if the firm pays a dividend
of 10 per year forever:

P0 = 10/.1 = 100

47


Now suppose the firm invests $2 in year 1 on a project that returns 10% per year forever. After year 1, it
pays everything out as a dividend. Then the following cash flows result:

EPS1 = 10 DIV1 = 8
EPS2 = 10.2 DIV2 = 10.2
EPS3 = 10.2 DIV3 = 10.2

PV of the firm's NPV of the
NO growth + firm's growth.
component. component (PVGO)

Notice that the investment did not alter the firm's value. Why? Because the NPV of the investment is zero.
So PVGO equals zero in this case. Zero NPV investments never alter a firm’s value.

Another example: Now suppose the firm invests $2 in year 1 in a project that returns 20% per year forever.
After year 1 all earnings are paid out as dividends. Thus,

EPS1 = 10 DIV1 = 8
EPS2 = 10.4 DIV2 = 10.4
EPS3 = 10.4 DIV3 = 10.4

48


PV of the firm's NPV of the
NO growth + firm's growth.
component. component (PVGO)

In this case PVGO = 2/1.1 > 0. Thus, the investment has increased the firm's value.

One can express a firm's stock price as:

P0 = PV of the no growth component of the firm + PVGO

Note: This formula is very general. It holds when the interest rate, growth rates and other factors vary over
time.

What is the PV of the no growth component?

Assume that if the firm does not invest it will not grow. Thus, setting DIVt=EPSt results in a constant
dividend forever, implying

PV of the no growth component of the firm = EPS1/r

We can now obtain P0 in terms of PVGO, EPS1 and r: P0 = EPS1/r + PVGO

49


Rearranging and solving for the earnings-price ratio produces:

If PVGO=0 the earnings-price ratio equals r. The earnings-price ratio is often used as a measure of a firm's
market capitalization rate.

Warning: Using the earnings-price ratio to estimate r is dangerous! If PVGO>0 then EPS1/P0<r. Generally,
the earnings-price ratio will underestimate r.

50

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