Great Britain produces some sixty per cent of its food requirements while only three per cent of its working population are working on farms. In the United States, there were still twenty- seven per cent of the nation's workers in agriculture at the end of World War I, and fourteen per cent at the end of World War II: the estimate for 1971 shows only 4·4 per cent. These declines in the proportion of workers engaged in agriculture are generally associated with a massive flight from the land and a burgeoning of cities.
