Recent attempts to incorporate optimal fiscal policy into NewKeynesian models subject to nominal inertia, have tended to assume that policymakers are benevolent and have access to a commitment technology. A separateliterature, on the New Political Economy, has focused on real economies...

[...]We begin by discussing the so-called first generation ofmodels, in which crises are viewed in the literature as theunavoidable result of unsustainable policies or fundamentalimbalances. Next, we survey the literature on the secondgeneration of models, which highlights the possibility of...