This document discusses demand analysis and the key concepts related to demand, including what demand is, types of demand, factors affecting demand, and the law of demand. It defines demand as the quantity of goods and services consumers are willing and able to purchase at various prices. The main factors affecting demand are identified as price, income, substitute prices, and consumer preferences. The law of demand states that, all else equal, as price increases quantity demanded decreases, and vice versa. Exceptions to the law include Giffen goods, Veblen goods, speculative demand, and essential goods.