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Cao, Jin; Illing, Gerhard (2008): Liquidity shortages and monetary policy. CESifo Working Paper, 2210

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Abstract

The paper models the interaction between risk taking in the financial sector and central bank policy for the case of pure illiquidity risk. It is shown that, when bad states are highly unlikely, public provision of liquidity may improve the allocation, even though it encourages more risk taking (less liquid investment) by private banks. In general, however, there is an incentive of financial intermediaries to free ride on liquidity in good states, resulting in excessively low liquidity in bad states. In the prevailing mixed-strategy equilibrium, depositors are worse off than if banks would coordinate on more liquid investment. In that case, liquidity injection will make the free riding problem even worse. The results show that even in the case of pure illiquidity risk, there is a serious commitment problem for central banks. We show that unconditional free lending against good collateral, as suggested by the Bagehot Rule, fails to address the moral hazard problem: Even though we consider a model with pure illiquidity risk, it turns out that such a policy will encourage banks to behave naughty, providing insufficient level of liquidity.

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