Supply and Demand | Page 2

FOR CONSUMPTION
§4. CAPITAL NOT A STOCK OF CONSUMABLE GOODS
§5. THE ESSENCE OF WAITING
§6. INDIVIDUAL AND SOCIAL SAVING
§7. THE NECESSITY OF INTEREST
§8. THE SUPPLY OF CAPITAL
§9. INVOLUNTARY SAVING
§10. INTEREST AND DISTRIBUTION

CHAPTER IX
LABOR
§1. A RETROSPECT ON LAISSEZ-FAIRE
§2. IDEAS AND INSTITUTIONS
§3. THE GENERAL WAGE-LEVEL
§4. THE SUPPLY OF LABOR IN GENERAL
§5. THE APPORTIONMENT OF LABOR AMONG PLACES
§6. THE APPORTIONMENT OF LABOR AMONG SOCIAL GRADES
§7. THE APPORTIONMENT OF LABOR AMONG OCCUPATIONS
§8. WOMEN'S WAGES

CHAPTER X
THE REAL COSTS OF PRODUCTION
§1. COMPARATIVE COSTS
§2. THE ALLOCATION OF RESOURCES
§3. UTILITY AND WEALTH
§4. CRITERIA OF POLICY

SUPPLY AND DEMAND

CHAPTER I
THE ECONOMIC WORLD
§1. Theory and Fact. The controversy between the "Theorist" and the "Practical Man" is common to all branches of human affairs, but it is more than usually prevalent, and perhaps more than usually acrid in the economic sphere. It is always a rather foolish controversy, and I have no intention of entering into it, but its prevalence makes it desirable to emphasize a platitude. Economic theory must be based upon actual fact: indeed, it must be essentially an attempt, like all theory, to describe the actual facts in proper sequence, and in true perspective; and if it does not do this it is an imposture. Moreover, the facts which economic theory seeks to describe are primarily economic facts, facts, that is to say, which emerge in, and are concerned with, the ordinary business world; and it is, therefore, mainly upon such facts that the theory must be based. People sometimes speak as though they supposed the economist to start from a few psychological assumptions (e. g. that a man is actuated mainly by his own self-interest) and to build up his theories upon such foundations by a process of pure reasoning. When, therefore, some advance in the study of psychology throws into apparent disrepute such ancient maxims about human nature, these people are disposed to conclude that the old economic theory is exploded, since its psychological premises have been shown to be untrue. Such an attitude involves a complete misunderstanding not merely of economics, but of the processes of human thought. It is quite true that the various branches of knowledge are interrelated very intimately, and that an advance in one will often suggest a development in another. By all means let the economist and psychologist avoid a pedantic specialism and let each stray into the other's province whenever he thinks fit. But the fact remains that they are primarily concerned with different things: and that each is most to be trusted when he is upon his own ground. When, therefore, the economist indulges in a generalization about psychology, even when he gives it as a reason for an economic proposition, in nine cases out of ten the economics will not depend upon the psychology; the psychology will rather be an inference (and very possibly a crude and hasty one) from the economic facts of which he is tolerably sure.
But the purpose of economic theory is not merely to describe the facts of the economic world; it is to describe them in their proper sequence and true perspective. It must begin with those facts which are most general and which have the widest possible significance. Those are not likely to be the facts which our practical experience forces most insistently upon our notice. For it is the particular and not the general, the differences between things rather than their resemblances, that concern us most in daily life. Nor are we likely to find the universal facts which we require in the sphere of public controversy. We must rather look for them in the dark recesses of our consciousness, where are stored those truths which are so obvious that we hardly notice them, which are so indisputable that we seldom examine them, which seem so trite that we are apt to miss their full significance.
§2. The Division of Labor. There is one such truth in the economic sphere which it is essential to appreciate vividly and fully, with the widest sweep of the imagination and the sharpest clarity of thought. Man lives by cooperating with his fellow-men. In the modern world, that cooperation is of a boundless range and an indescribable complexity. Yet it is essentially undesigned and uncontrolled by man. The humblest inhabitant of the United States or Great Britain depends for the satisfaction of his simplest needs upon the activities of innumerable people, in every walk of life and in every corner of the globe. The ordinary commodities which appear upon his dinner table represent the final product of the labors of a medley of merchants, farmers, seamen, engineers, workers of almost every craft. But there is no human authority presiding over this great complex of labor, organizing the various units, and directing them towards the common ends which they subserve. Wheel upon wheel, in a ceaseless succession of interdependent