An individual who pays taxes to his government, and who has rented land and employed labor and capital to engage in production, must indeed, besides the capital he has used in such production, call all his outlay in interest, wages, rent, and taxes, by the name of cost of production;(631) since, unless they all come back to him in the price of the commodity, the entire enterprise can only injure him.(632) He will, of course, add an equitable profit to remunerate him for his enterprise, since without such profit, he would not be able to live or produce; or else, he would be compelled to consume his capital. The moment the current rates of taxation, interest, wages and rent change in a country, the cost of production is also changed in the case of the individual engaged in production, however unaltered the technic process may remain.(633) But taking the nation, or all mankind into consideration, we must not lose sight of the fact that these three great sources of income, as well as taxation, are not, rightly speaking, sources from which income flows, but rather channels through which the aggregate income of the nation or the world is distributed among individuals.(634) Hence the wages of labor, for instance, which afford the means of living to the greater part of the population, cannot possibly be looked upon simply as a factor in economic production. The people considered in their entirety have the soil gratis. All saving made from rent, interest on capital, or wages, is nothing but a change of the proportion in which the results of production were distributed hitherto among coöperators in production. Such a change may be either advantageous or the reverse; but it is not a diminution of the amount of sacrifice which the people in general must make for purposes of production. Hence, in a politico-economical sense, to the cost of production, belongs only the capital necessarily expended in production, and which has disappeared as a part of the nation’s resources, abstraction made of the personal sacrifices in behalf of production.(635) The value of the circulating capital which in the process is entirely used up, must, of course, be entirely restored in the price, that of the fixed capital used only to the extent that it has been used.(636) The risk, which the producer runs until the commodity produced is actually consumed must also be borne in mind.(637) There are things which are a real risk in small enterprises that by the intervention of an insurance company, or where the enterprises are large and insure themselves, become a more or less variable portion of the cost of production. The price of the product, in the latter instance, rises, by this means, very regularly. In the former case, the rise depends partly on the feeling of the people whether their pleasure in gain is greater than their grief over a corresponding loss.(638)