Farmers need, as truly as any producers, to know the wants of the world for which they are producing food. The crops they plant in the spring will actually be consumed in large measure during the following year. Prudence suggests that they plant such crops as will be most in demand. If they judge by the market today, they are in danger of two errors: first, of overestimating the future demand, which may be satisfied before the new crop comes; second, of diverting from ordinary staple crops too large a portion of the crop-raising force. Common experience has taught that a high price of hops or onions or broom corn has almost certainly wrought a reduction of the price for succeeding crops below the normal cost. Still larger foresight is needed with reference to the raising of live stock, which requires more than a single season’s investment of capital. To stock a farm with hogs, sheep, cattle or horses, requires from one to five years of accumulated capital. The record of farm stock shows successive waves of such production in direct opposition to prudence. (Chart No. 4, p. 83.) The manufacturing world has similar experiences of imprudent consumption in the effort to forestall a market. But the record of failures in this respect is scarcely as marked, because of more business-like collection of information for the guidance of judgment. Farmers too generally follow the lead of their neighbors in adjustment of crops or stock. Manufacturers more generally try to do what their rivals are not doing. Success in producing what is not finally wanted we call overproduction. While the whole world is warned against this, each individual producer fails to study as well as he might the means of avoiding it. Prudential consumption does not properly provide for those speculative dealings which end simply in a readjustment of wealth by gains on the one side through losses on the other. All these imply an actual waste of wealth and energy, whether they are exhibited in a gambling machine or a board of trade. But there are certain great enterprises, like wonderful inventions, which involve a prudential consumption of wealth. The wealth consumed in developing the electric telegraph system, or in laying the Atlantic cable, everyone would judge to be well invested. Every thought of prudence sustains such expenditure. Yet the spirit of invention, as a mere venture in desire to hit upon something which may chance to be wanted, shows lack of prudence, and the world suffers by great waste of energy in this direction. The only test of prudential consumption in provision for the future market is in the careful study of all conditions, favorable and unfavorable.