Again the expected series of incomes may be declining, as the royalties (not typical rents) secured from mines. If the income is expected steadily to fall, and to disappear at the end of the twenty-fifth year, the value of the mine would be the capitalized sum of a limited and degressive series of incomes. [Sidenote: Mode of fixing the rate of time discount in practical business] Every exchange of a durable agent involves an estimate, rough and imperfect it may be, of that agent's future. The practical men, however, who are thus fixing the "capital value" of goods, are usually only dimly conscious of the logical nature of the process. In fact the process goes on in a way much less analytical and conscious, much more empirical, than this analysis would indicate. Most men simply buy as cheap as they can the agents which at the price they believe will add most to their income. The future changes are only roughly, not accurately estimated. The shrewd bargainer is the one who foresees more clearly than his fellows the complex changes to come. Other men blindly follow. The ability and the inability to foresee such changes make men rich and poor. In all this bidding for capital the logical basis of the value is the series of rents. When the agent is bought outright, the very concluding of the bargain fixes a relation between the expected value of the income and the value of the capital invested. In other words, the exchange of durable agents virtually wraps up in them a net income, which it is expected will unfold year by year when rents mature and are secured. At the moment of the investment, the expected rents are expressed as a percentage of the capital sum. § III. THE INCREASING ROLE OF CAPITALIZATION IN MODERN INDUSTRY [Sidenote: As exchange increases capitalization of goods becomes more usual] 1. _Where a system of exchange is highly developed, things are looked upon as capital yielding an objective income rather than as wealth yielding immediate means of enjoyment._ In the old organization of industry most men got most of their living from the things they raised or made. At the present time goods are gotten in the most indirect ways; men seek wealth because it will yield them an objective or money income, knowing that if they can get the income, they can get other things by exchange. In business to-day, wherever there is a rental, it is capitalized, has a market value, is bought and sold. Men compete in the purchase of income-yielding agents. There is a continual contest in judgment among investors to secure the largest rent for the smallest outlay. On the other hand, the owners of any rental strive to secure the largest capitalization for it that they can. In this market for capital it is money rents that are exchanged as an indirect means of arriving at gratifications. [Sidenote: Various kinds of corporation securities put expected incomes in salable form]