The Final Market Rates of Interest Reflect the PURE Interest Rate PLUS OR MINUS Entrepreneurial Risk and Purchasing Power Components

In the purely free and unhampered market, there will be no cluster of errors, since trained entrepreneurs will not all make errors at the same time. The “boom-bust” cycle is generated by monetary intervention in the market, specifically bank credit expansion to business. Let us suppose an economy with a given supply of money. Some of the money is spent in consumption; the rest is saved and invested in a mighty structure of capital, in various orders of production. The proportion of consumption to saving or investment is determined by people’s time preferences—the degree to which they prefer present to future satisfactions. The less they prefer them in the present, the lower will their time preference rate be, and the lower therefore will be the pure interest rate, which is determined by the time preferences of the individuals in society. A lower time-preference rate will be reflected in greater proportions of investment to consumption, a lengthening of the structure of production, and a building-up of capital. Higher time preferences, on the other hand, will be reflected in higher pure interest rates and a lower proportion of investment to consumption. The final market rates of interest reflect the pure interest rate plus or minus entrepreneurial risk and purchasing power components. Varying degrees of entrepreneurial risk bring about a structure of interest rates instead of a single uniform one, and purchasing-power components reflect changes in the purchasing power of the dollar, as well as in the specific position of an entrepreneur in relation to price changes. The crucial factor, however, is the pure interest rate. This interest rate first manifests itself in the “natural rate” or what is generally called the going “rate of profit.” This going rate is reflected in the interest rate on the loan market, a rate which is determined by the going profit rate.

—Murray N. Rothbard, America's Great Depression, 5th ed. (Auburn, AL: Ludwig von Mises Institute, 2000), 9-10.