The Friedman rule is a monetary policy rule proposed by Milton Friedman. Essentially, Friedman advocated setting the nominal interest rate at zero. According to the logic of the Friedman rule, the opportunity cost of holding money faced by private agents should equal the social cost of creating additional fiat money. It is assumed that the marginal cost of creating additional money is zero (or approximated by zero). Therefore, nominal rates of interest should be zero. In practice, this means that the central bank should seek a rate of deflation equal to the real interest rate on government bonds and other safe assets, to make the nominal interest rate zero.
The result of this policy is that those who hold money don't suffer any loss in the value of that money due to inflation. The rule is motivated by long-run efficiency considerations.
This is not to be confused with Friedman's k-percent rule which advocates a constant yearly expansion of the monetary base.
Read more about Friedman Rule: Friedman's Argument, Use in Economic Theory
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