What Is This "Monetary Policy" That You Refer To?

Tyler Cowen recently linked to a study by Alina Bartscher, Moritz Kuhn, Moritz Schularick, and Paul Wachtel of the effects of “monetary policy” on racial inequality. The study focuses specifically on the effect of unanticipated monetary shocks on racial inequality:

For the empirical analysis, this paper relies on the most widely used monetary policy shock series – the (extended) Romer-Romer shocks (Coibion et al., 2017) as well as different financial market surprise measures taken from Bernanke and Kuttner (2005) and Gertler and Karadi (2015). The estimations yield a consistent result. Over a five-year horizon, accommodative monetary policy leads to larger employment gains for black households, but also to larger wealth gains for white households. More precisely, the black unemployment rate falls by about 0.2 percentage points more than the white unemployment rate after an unexpected 100bp monetary policy shock. But the same shock pushes up stock prices by as much as 5%, and house prices by 2% over a five-year period, while lowering bond yields on corporate and government debt and pushing up inflation. The sustained effects on employment and stock and house prices appear to be a robust feature in the data, across different shock specifications, estimation methods, and sample periods.

These empirical results seem plausible to me, but what are the policy implications? In my entire life, I’ve never met anyone who favored having the Fed go around and create a bunch of “unexpected 100bp monetary policy shocks”.

You might argue that this doesn’t matter and that the results would also hold for anticipated changes in monetary policy. But decades of macroeconomic research suggests that one cannot draw this inference; unexpected changes in monetary policy have vastly different effects from expected changes in monetary policy. For instance, an unanticipated easing of monetary policy will often boost asset prices, while an anticipated expansionary policy will often reduce asset prices, as during the 1970s.

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