A Theory of Countercyclical Government Multiplier

Pascal Michaillat
American Economic Journal: Macroeconomics
​​​January 2014
volume・6
issue・1​
​pages・190–217
​DOI・​https://doi.org/10.1257/mac.6.1.190
abstract・I develop a New Keynesian model in which a type of government multiplier doubles when unemployment rises from 5 percent to 8 percent. This multiplier indicates the additional number of workers employed when one worker is hired in the public sector. Graphically, in equilibrium, an upward-sloping quasi-labor supply intersects a downward-sloping labor demand in a (employment, labor market tightness) plane. Increasing public employment stimulates labor demand, which increases tightness and therefore crowds out private employment. Critically, the quasi-labor supply is convex. Hence, when labor demand is depressed and unemployment is high, the increase in tightness and resulting crowding-out are small.