George Bernard Shaw,
Man and Superman — The Revolutionist's Handbook
(1903)
“ The economists who discovered that demand created supply soon had to limit the proposition to “effective demand,” which turned out, in the final analysis, to mean nothing more than supply itself; and this holds good in politics, morals, and all other departments as well: the actual supply is the measure of the effective demand; and the mere aspirations and professions produce nothing. ”
