... 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 current context, this means that the monetaryauthority ... basicresults on the limits to interest rate rules and on the admissable form of nominalanchors in the IS model.Having learned about the limits on interest rate rules in some standardmacroeconomic models, ... 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...