>warning controversial hypothesis

Prior to 1790, Clark asserts that man faced a Malthusian trap: new technology enabled greater productivity and more food, but was quickly gobbled up by higher populations.

In Britain, however, as disease continually killed off poorer members of society, their positions in society were taken over by the sons of the wealthy. In that way, according to Clark, less violent, more literate and more hard-working behaviour - middle-class values - were spread culturally and biologically throughout the population. This process of "downward social mobility" eventually enabled Britain to attain a rate of productivity that allowed it to break out of the Malthusian trap.