NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Moral Hazard Misconceptions: the Case of the Greenspan Put

Gideon Bornstein, Guido Lorenzoni

NBER Working Paper No. 24050
Issued in November 2017, Revised in November 2017
NBER Program(s):Economic Fluctuations and Growth, Monetary Economics

Policy discussions on financial market regulation tend to assume that whenever a corrective policy is used ex post to ameliorate the effects of a crisis, there are negative side effects in terms of moral hazard ex ante. This paper shows that this is not a general theoretical prediction, focusing on the case of monetary policy interventions ex post. In particular, we show that if the central bank does not intervene by monetary easing following a crisis, this creates an aggregate demand externality that makes borrowing ex ante inefficient. If instead the central bank follows the optimal discretionary policy and intervenes to stabilize asset prices and real activity, we show examples in which the aggregate demand externality disappears, reducing the need for ex ante intervention.

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Document Object Identifier (DOI): 10.3386/w24050

 
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