We examine the expectational stability (E—stability) of rational expectations equilibrium under optimal interest rate rules in the context of the standard, “New Keynesian” model of the monetary transmission mechanism. We focus on the case where the monetary authority adds interest rate...

We examine the stability of equilibrium in sunspot-driven real business cycle (RBC) models under adaptive learning. We show that the general reduced form of this class of models can admit rational expectations equilibria that are both indeterminate and stable under adaptive learning....