Neutrality of money is the idea that a change in the money supply affects only nominal variables in the economy such as prices, wages, and exchange rates, with no effect on real variables, like employment, real GDP, and real consumption. Neutrality of money is an important idea in classical economics and is related to the classical dichotomy. It implies that the central bank does not affect the real economy (e.g., the number of jobs, the size of real GDP, the amount of real investment) by creating money. Instead, any increase in the supply of money would be offset by a proportional rise in prices and wages. This assumption underlies some mainstream macroeconomic models (e.g. real business cycle theory, which models the response of the economy to shocks in real variables). However, economists generally find that money is neutral only in the long run; in the short run, price stickiness means changes in the money supply can produce changes in real variables such as employment. Superneutrality of money is a stronger property than neutrality of money. It holds that not only is the real economy unaffected by the level of the money supply but also that the rate of money supply growth has no effect on real variables. In this case, nominal wages and prices remain proportional to the nominal money supply not only in response to one-time permanent changes in the nominal money supply but also in response to permanent changes in the growth rate of the nominal money supply. Typically superneutrality is addressed in the context of long-run models.
History of the concept According to Don Patinkin, the concept of monetary neutrality goes back as far as David Hume. The term itself was first used by continental economists beginning at the turn of the 20th century, and exploded as a special topic in the English language economic literature upon Friedrich Hayek's introduction of the term and concept in his famous 1931 LSE lectures published as Prices and Production. Keynes rejected neutrality of money both in the short term and in the long term.
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