" Expanding prosperity contributed to the popularity of the doctrine of the harmony of interests in three different ways. It attenuated competition for markets among producers, since fresh markets were constantly becoming available; it postponed the class issue, with its insistence on the primary importance of equitable distribution, by extending to members of the less prosperous classes some share in the general prosperity; and by creating a sense of confidence in present and future well-being, it encouraged men to believe that the world was ordered on so rational a plan as the natural harmony of interests. It was the continual widening of the field of demand which, for half a century, made capitalism operate as if it were a liberal utopia. "

― Edward Hallett Carr , The Twenty Years' Crisis, 1919-1939: An Introduction to the Study of International Relations