Frictional Coordination
探讨了如何通过引入高阶不确定性形式的摩擦性协调，在微观基础的一般均衡模型中解释由总需求波动驱动的商业周期，并分析了其对政策制定的启示。
The notion that business cycles are driven by fluctuations in aggregate demand is subtle. I first review some of the conceptual and empirical challenges faced when trying to accommodate this notion in micro-founded, general-equilibrium models. I next review my own research, which sheds new light on the observed business cycles by accommodating frictional coordination in the form of higher-order uncertainty. This makes room for forces akin to animal spirits even when the equilibrium is unique. It allows demand shocks to generate realistic business cycles even when nominal rigidity is absent or undone by appropriate monetary policy. It modifies the general-equilibrium predictions of workhorse macroeconomic models in manners that seem both conceptually appealing and empirically relevant. And it offers new guidance to policy.