The real balances effect is also known as the Pigou effect, after its originator, Arthur C. Pigou. (1877-1959). Pigou was born on the Isle of Wight in England, and studied at Cambridge University. He eventually became the chair of political economy at Cambridge University, succeeding Alfred Marshall, who influenced Pigou greatly. Pigou was a welfare economist, meaning that he was concerned with how to maximize social well-being beyond the scope of the individual. He contributed to theories of income distribution, externalities, and price discrimination.

Keep in mind that Smith was writing during the time of the industrial revolution in Great Britain. At that time it was common to have wages that barely provided for physical subsistence, and often times fathers (the primary wage laborer), would forgo meals so that children could eat. Higher wages would allow workers, as Smith suggests, to increase bodily strength, and important dimension to productivity in late 18^th century Britain. Modern efficiency wage theory focuses more on worker morale and labor turnover, and less on the physical needs of workers, a central issue in Smith's time.

Robert Owen (1771-1858), owner of the New Lanark spinning mills in Scotland, attempted to put the idea of efficiency wages into practice. Owen, who owned and ran the mills from 1800-1820, also established the model community of New Lanark. Operating during the industrial revolution, a period in which wages were pushed to subsistence, Owen paid his workers significantly more than the prevailing wages of the time, and his mills were both productive and profitable.

Several economists developed formal theories of efficiency wages. These theories are summarized by George Akerlof and Janet Yellen, eds., in their book, Efficiency Wage Models of the Labor Market (Cambridge: Cambridge University Press, 1986).