Optimal Policy for Behavioral Financial Crises

Finance

Intervenant : Paul FONTANIER

Salle : T209

Abstract:

Should policymakers adapt their macroprudential and monetary policies when the financial sector is vulnerable to belief-driven boom-bust cycles? I develop a model in which financial intermediaries are subject to collateral constraints, and that features a general class of deviations from rational expectations. I show that distinguishing between the drivers of behavioral biases matters: when biases are a function of equilibrium asset prices, new externalities arise, even in models that do not have any room for policy in their rational benchmark. These effects are robust to the degree of sophistication of agents regarding their future biases. I show how time-varying leverage, investment and price regulations can achieve constrained efficiency. Finally, I show that greater uncertainty about the extent of behavioral biases in financial markets reinforces incentives for preventive action.

JEL Classification Numbers: D62, E44, E52, E70, G28 Keywords: Financial crises, Beliefs, Macroprudential policy, Monetary Policy