Indeed, one may say without overmuch exaggeration that at present the preservation of marriage as an institution is almost solely due to its tenacity as an instinctive habit. For while marriage is the strongest bulwark of the State, the economic order for the sake of which the State exists tends nevertheless to discourage marriage because it progressively concentrates wealth in a few hands, and thus deprives the great mass of people of adequate means to rear and educate families. This condition is largely responsible for the fact that celibacy, illegitimacy and prostitution are on the increase in every civilized country; and that the average age at which marriage takes place tends steadily to become higher, as it takes longer to get into an economic position which makes possible the support of a family. In this connexion, Katharine Anthony’s statement that factory-girls and heiresses are the country’s youngest brides is significant. Neither the heiress nor the factory-girl has anything to gain by waiting: the heiress already has economic security and the factory-girl never will have it, for she and her husband--if she marries in her own class--will always be pretty much at the mercy of conditions in the labour-market. It should also be remarked that among the great middle class the standard of education for both sexes, but more particularly for women, is higher than among the very rich and the very poor; and this tends to advance the average age for marriage. It tends as well to make children a heavy burden on the parents. Among primitive peoples, where difficulty in supporting a family is virtually unknown, where adjustment to the environment offers no complexities and childhood is therefore not so prolonged, and where, moreover, children through their labour become an economic asset, they are desirable.[16] But in a civilized society where the parental sense of responsibility has developed to the point where the child is reared for its own sake, where adaptation to the environment is a complex and lengthy process involving expensive education and prolonged dependence of the child upon the parents, and where the difficulty of getting a start in life tends also to lengthen the period of dependence; in such a society it is natural that the parental sense of responsibility should find expression in an artificial limitation of offspring to the number that the circumstances of the parents will enable them to educate properly. There is a further step that this feeling can suggest in these days of excessive economic exploitation and ruinous wars; that is, refusal to reproduce at all: and this step an increasing number of married people are taking, to the great distress of self-appointed guardians of our customs and morals.