Working Paper: CEPR ID: DP14239
Authors: Jos Azar; Emiliano Huetvaughn; Ioana Marinescu; Bledi Taska; Till von Wachter
Abstract: Why is the employment effect of the minimum wage frequently found to be close to zero? Theory tells us that when wages are below marginal productivity, as with monopsony, employers are able to increase wages without laying off workers, but systematic evidence directly supporting this explanation is lacking. In this paper, we provide empirical support for the monopsony explanation by studying a key low-wage retail sector and using data on labor market concentration that covers the entirety of the United States with fine spatial variation at the occupation-level. We find that more concentrated labor markets - where wages are more likely to be below marginal productivity - experience significantly more positive employment effects from the minimum wage. While increases in the minimum wage are found to significantly decrease employment of workers in low concentration markets, minimum wage-induced employment changes become less negative as labor concentration increases, and are even estimated to be positive in the most highly concentrated markets. Our findings provide direct empirical evidence supporting the monopsony model as an explanation for the near-zero minimum wage employment effect documented in prior work. They suggest the aggregate minimum wage employment effects estimated thus far in the literature may mask heterogeneity across different levels of labor market concentration.
Keywords: Minimum wage; Monopsony; Oligopsony; Labor markets
JEL Codes: J08; J42; J23; J80
Edges that are evidenced by causal inference methods are in orange, and the rest are in light blue.
| Cause | Effect |
|---|---|
| Labor Market Concentration (HHI) (J42) | Employment Elasticity of Minimum Wage (J38) |
| Minimum Wage Increase (J38) | Employment Effects in High Concentration Markets (J42) |
| Minimum Wage Increase (J38) | Employment Effects in Low Concentration Markets (J42) |
| Labor Market Concentration (HHI) (J42) | Minimum Wage Increase Employment Effects (J38) |