Checks more Effective as Wealth Increases.—It is clear that the dominant motives which restrain the growth of population act more powerfully on the well-to-do classes than on the poor. The need of invested wealth, the need of education, the determination to adhere to a social standard of comfort and to avoid losing caste, are stronger in the members of the higher classes than in those of the lower ones, and become more dominant in the community as more and more of its members belong to the upper and the middle classes.
Immediate Causes of a Slow Increase of Population.—The economic motive for a slow growth of population can produce its effect only as it leads to some line of conduct which insures that result. Means must be adopted for attaining the end desired, and when one looks at some of the means which are actually resorted to, he is apt to get the impression that an indispensable economic result is in some danger of being attained by an intolerable moral delinquency. Must the society of the future purchase its comforts at the cost of its character? Clearly not if the must in the case is interpreted literally. A low birth rate may be secured, not at the cost of virtue, but by a self-discipline that is quite in harmony with virtue and is certain to give to it a virile character which it loses when men put little restraint on their impulses. Late marriages for men stand as the legitimate effect of the desire to sustain a high standard of living and to transmit it to descendants; and late marriages for women stand first among the normal causes of a retarded growth of population. Moreover, the same moral strength which induces men to defer marriage dictates a considerate and prudent conduct after it, and prevents unduly large families without entailing the moral injury which reckless conduct involves. On the other hand, there may be an indefinite postponement of marriage by classes that lack moral stamina and readily lapse into vice. There are vicious measures, not here to be named in detail, which keep down the number of births or increase the number of deaths, mostly prenatal, though the infanticide of earlier times is not extinct. By strength and also by weakness, by virtue and also by vice, is the economic mandate which limits the rate of growth of population carried out. A limit of growth must be imposed if mankind is to make the most of itself or of the resources of its environment. There is no great doubt that it will be so imposed, and the great issue is between the two ways of doing it; namely, that which brutalizes men and depraves them morally and physically, and that which places them on a high moral level.
Moral Losses attending Civilization.—There is little doubt that vice has made gains which reduce in a disastrous way the otherwise favorable results of increasing wealth. The "hastening ills" that are said to attend accumulating wealth and decaying manhood have come in a disquieting degree and forced us to qualify the happy conclusions to which a study of purely economic tendencies leads. The evil is not confined to the realm of family relations, but pervades politics, "high finance," and a large part of the domain of social pleasures. The richer world is the more sybaritic—self-indulgent and intolerant of many moral restraints; and if one expects to preserve an unquestioning trust in the future, he must find a way in which the economic gains which he hopes for can be made without a casting away of the moral standards which are indispensable. The greatest possible achievement in this direction would be an abandonment of vicious restraints on population and a general increase of the forethought and the self-command which even now constitute the principal reliance for holding the birth rate within prudent limits.
The Working of Malthusianism in Short Periods as Contrasted with an Opposite Tendency in Long Ones.—There is little doubt that by a long course of technical improvement, increasing capital, and rising wages, the laboring class of the more prosperous countries have become accustomed to a standard of living that is generally well sustained and in most of these countries tends to rise. There is also little uncertainty that a retarded growth of population has contributed somewhat to this result. One of the facts which Malthus observed is consistent with this general tendency. Even though the trend of the line which represents the standard of living be steadily upward, the rise of actual wages may proceed unevenly, by quick forward movements and pauses or halts, as the general state of business is flourishing or depressed. In "booming" times wages rise and in hard times they fall, though the upward movements are greater than the downward ones and the total result is a gain.
Now, such a quick rise in wages is followed by an increase in the number of marriages and a quick fall is followed by a reduction of the number. The birth rate is somewhat higher in the good times than it is in the bad times. Young men who have a standard of income which they need to attain before taking on themselves the care of wife and children find themselves suddenly in the receipt of such an income and marry accordingly. There is not time for the standard itself materially to change before this quick increase of marriages takes place, and the general result of this uneven advance of the general prosperity may be expressed by the following figure:—
The line AC measures time in decades and indicates, by the figures ranging from 1 to 10, the passing of a century. AB represents the rate of wages which, on the average, are needed for maintaining the standard of living at the beginning of the century; and CD measures the amount that is necessary at the end. The dotted line which crosses and recrosses the line BD describes the actual pay of labor, ranging now above the standard rate and now below it. Whenever wages rise above the standard, the birth rate is somewhat quickened, and whenever they fall below it, it is retarded; but the increase in the rate does not suffice to bring the pay actually down to its former level. The descent of the dotted line is not equal to the rise, and through the century the earnings of labor fluctuate about a standard which grows continually higher.
The pessimistic conclusion afforded by the Malthusian law in its untenable form requires (1) that the standard of living should be stationary and low, and (2) that wages should fluctuate about this low standard. In this view the facts would be described by the following figure:—
AC measures a century, as before, by decades, and the height of BD above BC measures the standard of living prevailing through this time. The dotted line crossing and recrossing BD expresses the fact that wages sometimes rise above the fixed standard and are quickly carried to it and then below it by a rapid increase in the number of the laborers.