Theories of Wages

Nominal Wages and Real Wages

Nominal (or money) wages are the amount of money a worker receives as payment for labour, expressed in currency terms. Real wages measure what that money wage can actually buy — its purchasing power in terms of goods and services, after adjusting for the price level. A worker's money wage may rise while the real wage falls, if prices rise faster than money wages; this distinction matters for judging whether workers' living standards have genuinely improved.

Subsistence Theory of Wages (Iron Law of Wages)

Associated with David Ricardo and later restated by Ferdinand Lassalle as the "Iron Law of Wages," the subsistence theory argues that, in the long run, wages tend to settle at the level just sufficient for workers to subsist and reproduce the labour force — no more, no less. The reasoning follows a Malthusian population logic: if wages rise above the subsistence level, workers' living conditions improve, population grows faster, labour supply increases, and competition among workers pushes wages back down. If wages fall below subsistence, malnutrition and higher mortality shrink the labour force, making labour scarce and pushing wages back up. Wages thus oscillate around, and are pulled back toward, a long-run subsistence equilibrium.

The theory has been widely criticised for its rigid, mechanical link between wages and population, and for ignoring trade unions, technological progress, and government intervention — all of which have allowed real wages to rise well above bare subsistence in modern economies. It is studied today mainly for its historical importance in the development of wage theory.

Wages-Fund Theory

Propounded by John Stuart Mill, the wages-fund theory holds that at any point in time, a fixed stock of circulating capital in the economy — the "wage fund," accumulated from past savings and set aside specifically to pay labour — is available to pay wages. The average wage rate is simply this wage fund divided by the number of workers seeking employment:

On this view, wages can rise only if the wage fund grows faster than the workforce, or if the workforce shrinks. Mill himself later abandoned strict belief in a rigidly fixed wage fund, and the theory was criticised for treating the fund as fixed and pre-determined rather than something that responds to the economy's productive capacity and demand for output.

Marginal Productivity Theory of Wages …