The occupation of the stock-jobber yields no new or useful product; consequently having no product of his own to give in exchange, he has no revenue to subsist upon, but what he contrives to make out of the unskilfulness or ill-fortune of gamesters like himself.
Book III, On Consumption, Chapter IX, p. 481 (See also: Karl Marx, Capital, Volume III, Chapter XXVII, p. 440) - A Treatise On Political Economy (Fourth Edition) (1832)