 In 1993, John B Taylor formulated the idea of a Taylor rule, which is a reduced form approximation of the responsiveness of the nominal interest rate, as set by the central bank, to changes in inflation, output, or other economic conditions.In particular, the rule describes how, for each one-percent increase in inflation, the central bank tends raise the nominal interest rate by more than one percentage point.This aspect of the rule is often called the Taylor principle.