CHAPTER 16
INTEREST ON MONEY LOANS
§ I. VARIOUS FORMS OF CONTRACT INTEREST
Distinction between contract interest and time-value
1. Interest, the amount paid according to contract by one person to another for credit given in terms of money, is but one expression of a larger problem, that of the difference in present worth of goods at two periods of time. This larger problem appears under several forms: first, as a difference in value, due to time, where there is no money expression (to be considered in the following chapter); second, in discount on a money loan for a short, definite time; third, in a long-time money loan at a fixed rate of interest; fourth, in a credit loan—that is, the sale of the thing on credit in terms of money.
The last three cases involve interest more or less clearly. Time-discount, as will be more fully explained, is the basis of interest. The interest may be greater or less than the time-discount in the goods, owing to miscalculation on the part of the borrower or to an unforeseen change in the conditions. Men bid for the use of wealth with the intention of repaying it at some future time, and the interest they agree to pay is based on their estimate of the discount of future rents, which they think is involved in the present valuations of the goods. Time-discount is involved in goods, however, in numberless cases where there is no contract interest. Even a Robinson Crusoe must recognize in his consumption goods and in his various indirect agents differences in value at different periods of time, of which he must take account.
Risk and expenses to the money-lender
2. Gross interest must be distinguished from net interest. The forms of wealth yielding incomes are so mutable, and are used under such complicated conditions, that both in theoretical discussion and in practice much care is needed to distinguish between the yield attributable to the income-bearer, and that attributable to other wealth or services used in connection with it. That the sum paid as interest on a loan contains other elements is recognized constantly in practice. As in the case of contract-rent allowance must be made for repairs and depreciation, so in the case of contract-interest allowance must be made for risk, or the average loss occurring in the industry. Money loaned in hazardous ventures must yield a higher rate of interest. Likewise capital used by the owner in a hazardous venture must frequently earn very high returns (not all logically interest) to offset the losses that are likely to occur.