A person wishing to make an exchange of the opposite kind to that described may sell his wealth for money; he may exchange for present enjoyable goods his income at its capitalized value; or he may use up what he has, let it depreciate, fail to make repairs, convert it to various consumption purposes, and thus invade his earning power. When the interest rate is five per cent., the sacrifice of any unit of regular income permits the spending of twenty times that amount for present enjoyment. The advantages of these various methods tend to equilibrium. If the owners of developed productive agents hold them at too high a capitalized value, investors will apply their efforts and savings to duplicating these forms of wealth. If, in turn, any of the minor factors, as materials or uses of goods, are overvalued (overcapitalized) it will appear ultimately in a check in the demand for them at these prices, and in a reduction in the demand for money loans. As it is possible for any investor and for any borrower to choose among these investments and loans, there is practically but one rate, the rate which expresses the general ratio of exchange between present and future income. Owners and investors take the line of least resistance, get the most they can for their money, and choose whatever form is most advantageous. The interrelations between the various interest rates are therefore close and constant. The market rate of interest thus extends over all forms of wealth and pervades every phase of business. The value of every durable agent is fixed with reference to a prevailing interest rate, through the discounting to their present worth of all the incomes it is believed to contain. [Sidenote: A sacrifice sale involves a high rate of interest]