Central Bank Screening, Moral Hazard, and the Lender of Last Resort Policy

This paper establishes a theoretical model to examine the LOLR policy when a central bank can distinguish solvent banks from insolvent ones only imperfectly. The major results that our model produces are as follows: (1) The pooling equilibria in which, on one hand, all the banks borrow from the central bank and, on the other hand, all the banks do not borrow from the central bank could exist given certain market beliefs off the equilibrium path. However, neither equilibrium is socially efficient because insolvent banks will continue to hold their unproductive assets, rather than efficiently liquidating them. (2) Higher precision in central bank screening will improve social welfare not only by identifying insolvent banks and forcing them to efficiently liquidate their assets, but also by reducing moral hazard and deterring banks from choosing risky assets in the first place. (3) If a central bank can commit to a specific precision level before the banks choose their assets, rather than conducting a discretionary LOLR policy, it will choose a higher precision level to reduce moral hazard and will attain higher social welfare.