The complexity and variety of tasks performed by the price system will be illuminated by an examination of three specific economic problems.

Individuals must be distributed among occupations in such a way as to serve two basic purposes. First, the labourer must be placed where he is most productive—making certain that Enrico Fermi becomes a physicist rather than a chef and that there are not too many plumbers and too few electricians. Second, the individual worker should be given an occupation that is congenial to him; since he will spend a large part of his life at work, it will be a better life if he can choose the type he prefers.

The price of labour is the instrument by which workers are distributed among occupations: wages in rapidly growing occupations and rapidly growing parts of the nation are higher than in corresponding employment in declining occupations and areas. The choice of occupation involves, however, much more than simply a comparison of wage rates. The following are a few of the complications: (1) The wages of an occupation must as a rule be sufficient to compensate the costs of training. (2) The wages of an occupation must be sufficient to compensate special disadvantages (such as a large chance of unemployment). (3) Wages must be higher in large cities than in small because living costs are higher in large cities. (4) Wages must compensate workers for their additional skill as they acquire experience (they usually reach a peak of earnings between ages 40 and 55) and thereafter decline as the worker’s efficiency declines. (5) Wages will reflect differences in taxation, fringe benefits (pensions, vacations), etc. Accordingly, the wage structure even for a single occupation in a single city is elaborate. When a single wage (price) is imposed upon an occupation, labourers are no longer properly distributed by wages; for example, a city school system that pays all teachers of given experience the same wage finds it difficult to staff its less-attractive schools.

The preferences of the individual worker cannot be given full play, or each person would become president of the corporation at a sumptuous salary. Yet the labourer may choose to live in California rather than Maine; then the price system will incite employers to move their operations to California, where they can hire this labourer more cheaply. The labourer may prefer to work long hours or short hours, and employers are induced by wage offers to cater to the labourer’s diverse preferences. In fact, it is equally appropriate to speak of the worker’s buying conditions of work and of the employer’s buying the services of the worker.

A society has some resources that can be replaced by investment; timber, for example, is now largely grown as a commercial crop. Farmland is a more ancient example: the fertility of soil can be increased by prudent cultivation. Other resources are not replaceable, such as coal and petroleum. How does the price system conserve these exhaustible resources?

The method of using a resource is independent of the pattern over time of income and expenditures that the owner of the resource desires. Suppose that a farm will have a value of $100,000 if it is maintained at a constant level of fertility and yields a yearly income of $10,000 forever but that it can be cultivated (“mined”) intensively to yield $12,000 a year for five years at the cost of a much reduced yield thereafter, with a value of $90,000. Even if the farmer is in urgent need of immediate funds and does not expect to live more than five years, he will still cultivate the farm at the uniform rate. Only then is it worth its maximum value to him, and only then (by sale or mortgage) can he obtain the largest-possible funds even in the near future. In short, one need not adapt his expenditure pattern to his income pattern so long as he can borrow or lend.

If the growth of consumption or the decline of reserves threatens the exhaustion of supplies of a resource, then the price of that resource will rise and promise to rise more in the future, and this rise will serve to reduce current consumption and to reward the owner of the resource for holding back much of the supply for the future. This rise in price will therefore also stimulate buyers to find more economical ways of using the commodity (for example, burning the fuel more efficiently) and stimulate producers to find new supplies or substitute products. The price system will therefore ensure that the supply of the resource will be stretched out so that the resource will be available in both the present and the future.