that is the primary object of interest, problems of public revenue and expenditure being strictly subordinated. That is to say, instead of trying to promote national prosperity in order that there may be more taxes and other forms of public revenue, the modern policy is to promote general prosperity for its own sake, and to raise revenue for the government only when, and to the extent that, it is necessary to do so in order to promote the general welfare.
MERCANTILISTS AND PHYSIOCRATS
Even when students began to focus their attention upon general economic prosperity, it took them some time to develop a really broad view of that problem. One school, known as the mercantilists, emphasized commerce, particularly foreign commerce, to such an extent as to make it seem that they identified prosperity with foreign trade. Writers of this school, for example, were accustomed to point out that an abundant supply of cheap labor was one factor in the development of foreign trade, because with cheap labor the country could compete with rival nations in international trade. This was obviously not intended to promote the prosperity of the laborers who were to supply the cheap labor. Another school, the physiocrats, emphasized the importance of agriculture as the industry which really produced a surplus over and above the cost of production.
Both these schools made the mistake of assuming an analogy between public prosperity and private prosperity. A private business which sells more than it buys, or takes in more money than it pays out, is said to be prosperous. The mercantile school assumed the same to be true of the nation at large, overlooking the fact that in the nation at large what is profit to one man may be cost to some one else, as in the case of the merchants who exported goods at a profit because they paid the laborers so little for their work. Again, a private business may be said to be prosperous when its products are greater than its costs. In agriculture there is the rent of land, which is not, strictly speaking, a cost, but a surplus income to the owner. This surplus income is the surplus value of the produce over and above the cost of producing it. Since very little rent was produced by the handicraft manufacturers of the day, the physiocrats assumed that these were not very profitable industries for the country at large,
