NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Conventional and Unconventional Monetary Policy with Endogenous Collateral Constraints

Aloísio Araújo, Susan Schommer, Michael Woodford

NBER Working Paper No. 19711
Issued in December 2013
NBER Program(s):   EFG   ME

We consider the effects of central-bank purchases of a risky asset, financed by issuing riskless nominal liabilities (reserves), as an additional dimension of policy alongside “conventional” monetary policy (central-bank control of the riskless nominal interest rate), in a general-equilibrium model of asset pricing and risk sharing with endogenous collateral constraints of the kind proposed by Geanakoplos (1997). The existence of collateral constraints allows our model to capture the common view that large enough central-bank purchases would eventually have to affect asset prices. But even when central-bank purchases raise the price of the asset, owing to binding collateral constraints, the effects need not be the ones commonly assumed. We show that under some circumstances, central-bank purchases relax financial constraints, increase aggregate demand, and may even achieve a Pareto improvement; but in other cases, they may tighten financial constraints, reduce aggregate demand, and lower welfare. The latter case is almost certainly the one that arises if central-bank purchases are sufficiently large.

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Document Object Identifier (DOI): 10.3386/w19711

Forthcoming: Conventional and Unconventional Monetary Policy with Endogenous Collateral Constraints, Aloísio Araújo, Susan Schommer, Michael Woodford. in Lessons from the Financial Crisis for Monetary Policy, Gertler. 2014

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