... real income, and the nominal interest rate. In ation and In ationary ExpectationsDuring the 1950s and 1960s, the simple IS model proved inappropriate forthinking about sustained in ation, so the ... solu-tion using this method, we must circumscribe the interest rate rule so that the limiting sum in the solution for the in ation rate in (15) is finite as we lookfurther and further ahead.13 In the ... pure interest rate rules could in the basic IS model.19 The difference between these two policies involves the extent of “basedrift” in the nominal anchor, i.e., they differ in terms of whether...