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.

Distinction between contract interest and time-value.

Risk and expenses to the moneylender.

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.

The lender must also, in estimating net interest, count the cost of placing, supervising, and collecting the loan. A pawnbroker lends only small sums and spends much time and effort to keep at interest a moderate capital. Five thousand dollars loaned in sums averaging ten dollars represents five hundred transactions, and yet if placed at five per cent, it yields but two hundred and fifty dollars a year. While, therefore, the borrower of a small sum estimates the economic interest (or anticipated gain in income) even higher than the oppressively high contract-interest he may be forced to pay, the lender must credit a large part of the gross interest to the labor he expends in carrying on the business.

Short-time loans by discounting of commercial paper.

3. The most usual form of short-time loan is that made by a bank or broker to business men on security of commercial paper. By commercial paper is meant promissory notes given by customers of the merchants, bills of lading for goods that have been shipped to their customers, and various other evidences of indebtedness that may be offered the banks for discount. When goods have been sold on time (as thirty, sixty, or ninety days) the seller has the choice between letting the time expire and collecting the bills direct from the customers, and discounting the bills for ready money at the bank. According to the conditions and needs of the particular business, either method may be chosen. In most industries there is need for larger capital at the seasons when the product is put upon the market. The merchant or manufacturer plans his business in the expectation of an average rate of discount at such times, and if it chances that the discount rates are abnormally high, he has no choice but to go on borrowing and paying the high interest out of the expected profits of his business. This risk of a change in the interest rate is one of many chances he has to run.

4. Most debts in modern times are outstanding for a term of years and represent the lender's purchase of a claim on the earnings of some productive enterprise. The simplest forms of long-time loans are those made on the security of real estate, which is mortgaged to the lender for the term of the debt. Usually the debtor is obliged to pay the interest either annually or semi-annually, and often, but not always, is permitted to reduce the principal by partial payments. These real-estate mortgages rest on the security of the particular mortgaged wealth, and, unlike most short-time loans in bank, are not personal obligations resting on the general credit of the borrower. Most other long-time debts share this character of being non-personal; if payment is defaulted, only the particular wealth can be sold for payment, not the general wealth of the borrower. Corporation bonds, issued by railroads and other large stock companies, have increased greatly in number in recent years. They yield an income fixed in advance, and are secured usually by mortgage on the entire property of the corporation issuing them. The income of some special kinds of "preferred stocks" is so guaranteed as to make them for investors substantially the same as bonds. Another large class of long-time loans are those made by national, state, and local governments. Tens of billions of dollars of public debts are now outstanding, held by private investors in every walk of life.

Long-time loans by purchase of mortgages, bonds, and stocks.

The contract in the case of each kind of these loans provides for a fixed term after which the borrower must repay or renew, and for a fixed rate on the nominal or par value of the loan. Nearly all the securities (bonds, certificates, evidences of indebtedness) are salable at a market rate. It is therefore the income that is fixed, the selling price (or capital value) fluctuating above or below the nominal sum except just at the moment when it is payable. The longtime loan thus is very similar in its economic character to the old-time rent-charge.

The cost of credit to the improvident buyer.

5. The sale of goods on credit is a mode of lending and involves interest in a disguised form. In some cases merchants will not sell cheaper for cash than for credit, for fear of offending their main body of credit customers; but this is exceptional, as there are good reasons why such a difference should be made. The credit sale usually involves interest, and often at a very high rate. In many stores there are two appreciably different prices, one for "slow pay," the other for " spot cash." If a bill paid at the end of the month is five per cent, more than the cash price, the difference is equal to sixty per cent, per annum for the privilege of postponing payment. Such a rate of interest is paid only by the improvident, but that is a large class ranging from factory workers to college students. The cash discounts allowed by merchants clearly express the time difference. On fifty to one hundred dollars of outstanding bills, many perfectly honest persons are paying interest at the rate of seventy-five per cent, per annum. The merchant is forced to make this difference because he must seek not only to earn interest on the capital thus invested, but to recover the costs of bookkeeping and collections, and the risk and loss of unpaid bills. The discounts allowed by manufacturers and wholesale houses measure in the same way the difference between cash and credit sales. Not unusual is a discount of "six per cent, in ten days, five per cent, in thirty, or sixty net." The buyer allowing his bills to run for two months (six per cent, for sixty days) pays thirty-six per cent, per annum for the use of that money. The difference is so great that it is impossible to carry on in this way a large business against strong competition. Such purchases on credit frequently are made, however, by dealers in small towns.

6. Interest is often concealed under other forms which increase the apparent rate. This fact is well shown in the ways by which usury laws fixing the legal rate of interest are evaded. A simple method is for the lender to charge a commission for making the loan, or, if it is a bank, to charge for a pretended cost of exchange to bring the money from some other city. Sometimes the borrower is required to keep larger deposits with the bank than he voluntarily would. Needing $5000, he is compelled to borrow $10,000 and to pay interest on twice as much as he is permitted to use. Again the borrower, in periods of unusual demand for money, is forced to make a long loan instead of a short one. When a one month's loan at ten per cent, would meet his need, he is forced to borrow for twelve months at six per cent., during ten months of which time four or five per cent, is the prevailing rate. In these and other ways the real rate, or burden of the loan, is made different from that which is expressed.

Evasion of legal rate of interest.