The neoclassical theory of interest, or loanable funds theory, holds that the interest rate is determined by the supply and demand for loanable funds. The demand for loanable funds comes from investment, consumption/dissaving, and hoarding. The supply comes from savings, bank credit, dishoarding, and disinvestment. The interest rate reaches equilibrium when the total demand for loanable funds equals the total supply. Critics argue the theory assumes full employment, does not precisely determine the interest rate, and is impractical.
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