(p. 435) . . . , the inexorable growth in the proportion of our GDP that is conceptual, especially technological, has increased the value of intellectual power relative to the value of human brawn many times over many generations. I am old enough to remember when physical prowess on the job was the source of legend and reverence. A large statue of Paul Bunyan, the mythical logger, still oversees the northern Minnesota lake country. Stevedores of a century ago were extolled for their brute strength. Today, the activities once carried out by stevedores are often run by young women at a computer console.
Greenspan, Alan. The Age of Turbulence: Adventures in a New World Economic Flexibility. New York: Penguin Press, 2007.