The should not be confused with the profit system. By the profit system, of course, we mean the institution of private property in capital goods and the free private enterprise that goes along with it. There is no reason why the "profit motive" should be necessarily connected with the profit system. In a profit system there is nothing to prevent anyone acting on altruistic lines; there is no law that says a businessman must maximize his profits. If a businessman chose to operate with outputs, prices, and wages that yielded him a smaller profit than the maximum, but which he felt were socially more desirable, there is nothing in the profit system that would prevent him from doing this. Nothing in the profit system would prevent the most ardent liberal from refusing an increase in wages, or from accepting an unpleasant and poorly paid job. At the other extreme, there is nothing in a communist system that would do away with the profit motive, or the "advantage motive."

Reconstruction is merely a special case of economic progress. If we are to understand its problems thoroughly, we must examine what is meant by economic progress and try to discover how it comes about... Economic progress is not altogether easy to define and is even more difficult to measure. Nevertheless, the phrase clearly corresponds to a meaningful idea. We have only to contrast a savage society with our own. In a savage society, the same customs, the same techniques, the same ways of doing everything, from ploughing to praying, are maintained generation after generation, son following exactly in the footsteps of his father and daughter in the footsteps of her mother, without deviating an inch from the well-trodden way. In modern civilized society, on the other hand, there is constant change and flux; we are constantly improving on the methods of our ancestors, and indeed one of the surest ways to discredit anything is to call it "old-fashioned!"

This concept of capital-rebuilding is so important that it may be desirable to digress for a moment. In the broadest sense of the word, capital means the sum total of the valuable things possessed by the individuals of a society, excluding "claims," that is, mere titles to property. The word is used to mean both the inventory of these valuable things; the houses, factories, machines, livestock, stocks of raw materials, and goods in all stages of completion; and also to mean the sum of the values of these things. It should generally be clear from the context which of these two meanings is intended.

The main key to the economics of the postwar world is a simple truism — that the rate of accumulation is equal to the rate of production less the rate of consumption. This is the "Bathtub Theorem." Production may be likened to the flow of water from the faucet, consumption to the flow down the drain. The difference between these two flows is the rate at which the water in the bathtub - the total stockpile of all goods - is accumulating.
War drains the economic bathtub in a great waste of consumption. The first problem of reconstruction is to rebuild the stockpile. It can be rebuilt only by widening the gap between production and consumption, or, in the case of a single country, by importing more than is exported. It is difficult for a ravaged country to increase either its production or its net imports. Unless it can obtain outside help, therefore, it must suffer a drastic restriction of consumption. Frequently the only way consumption can be restricted is by inflation. Here, therefore, is the key to the most fundamental problems of reconstruction.

The discounting presumably is to be done for each period of time at that rate of interest which represents the alternative cost of employing capital in the occupation in question; that is, at the rate which the entrepreneur could obtain in other investments

It is probable that when future historians of economic thought look back over this century, the thirties will appear as an era of rapid development in economic theory. Not only has there been unusual activity in monetary theory, theory of value. but extensive transformations have also been made in the basic theory of value. The outstanding publications in this field are, of course, Joan Robinson's Theory of Imperfect Competition and Chamberlin's Theory of Monopolistic Competition, the first produced in Cambridge, England, and the second in Cambridge, Massachusetts. These volumes mark the explicit recognition of the theory of the firm as an integral division of economic analysis upon which rests the whole fabric of equilibrium theory. General equilibrium is nothing more than the problem of the interaction of individual economic organisms, under various conditions and assumptions; as a necessary preliminary to its solution, an adequate theory of the individual organism itself is necessary.

There is reason for this shift of emphasis from any actual price to a hypothetical 'equilibrium' price. It is usually more interesting to know where a train is going than to know exactly where it is at any moment. The 'equilibrium' position of any price, wage, firm, industry, or system is the position toward which it is tending. The importance of equilibrium analysis, then, is that it enables us to discuss the directions of change. If a train is in New- York and its 'equilibrium' position is in Chicago, we are reasonably confident that the general direction of its motion will be westward, even if it unaccountably decides to travel north for the first hundred and fifty miles.

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A firm may be defined as an institution which buys things, transforms them in some way, and then sells them with the purpose of making a profit. The things a firm buys we shall call "inputs." The things it sells we shall call "outputs." The process whereby the things it buys are transformed into the things it sells we shall call the "process of production." In any process of buying to sell again a process of production is always involved...