Minimum Wage Employment Effects and Labor Market Concentration
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Minimum Wage Employment Effects Vary By Labor Market Concentration. A 10% rise in the minimum wage boosts employment by ~3.5% in highly concentrated markets but reduces it by 2% in less concentrated ones. @EmilianoHuetVaughn
when it rains it pours, released Wednesday new paper finds that increases in minimum wages can increases employment in the most concentrated labor markets. paper found a 10% increase in the minimum wage had no effect on average, but increases employment by ~3.5% in the most concentrated labor markets while decreases employment by 2% in the least concentrated markets
"...Economic theory predicts that the minimum wage reduces employment in a competitive labor market. However, empirical evidence has often failed to find a negative impact. The common explanation: monopsony power by the firm. In this paper, we present the first direct empirical evidence showing labor market concentration - a key determinant of monopsony power - modulates the impact of the minimum wage on employment in the general merchandise sector in the US, a key employer of workers affected by the minimum wage. We find a robust and significant increase in the employment elasticity with respect to the minimum wage in more concentrated occupational labor markets. In the most concentrated third of these, the minimum wage employment elasticity is even estimated to be significantly positive....Our results indicate that, consistent with theory, more concentrated labor markets exhibit more positive employment effects from the minimum wage. This is true for a variety of specifications, and when separatelyusing concentration measures for three different minimum wage heavy occupational labor markets: stock clerks, retail sales, and cashiers. To give a sense of scale, a standard deviation increase in the measure of labor market concentration is associated with a significant 0.2 increase in the employment elasticity of the minimum wage. The results are robust to a number of sensitivity tests. One important concern is omitted variable bias: there may be a variable correlated with concentration that causally modulates the impact of the minimum wage on employment. We note that, even if it were the case, concentration is still a useful proxy for this variable and can allow policy makers to predict the effects of a minimum wage increase. We are nevertheless interested in testing for potential alternative mechanisms that explain the heterogeneity of the minimum wage employment effects and we focus on two key candidates for the omitted variable: population density and productivity, which are both correlated with HHI and could also modulate minimum wage effects. We find that results are robust to allowing for a different effect of the minimum wage by both population density and a productivity proxy (economy-wide earnings in an area conditional on population). This robustness test supports our main findings: concentration has a significant modulating effect on the employment elasticity of the minimum wage even after we allow other key variables to have their own modulating effects.Overall, then, our results indicate the size and sign of the minimum wage’s employment effects vary substantially on the basis of underlying labor market concentration. Employment elasticities of the minimum wage are significantly negative with point estimates of approximately -0.2 for the 33% of least concentrated labor markets, approximately zero for the middle concentration group, and significantly positive with point estimates of approximately 0.35 for the 33% of most concentrated of labor markets (which are very concentrated by typical measures). The related own-wage elasticity of labor demand, which we also derive, spans the range of comparable elasticities estimated in the minimum wage literature (see Figure 6), with the 33% of least concentrated markets on the outer left (i.e. the most negative) of the prior work’s estimate range, the 33% of most concentrated markets forming the outer rightward bound (most positive) of this range, and, the middle third’s estimates being close to zero.This indicates that differences in the degree of monopsony power could play an important role in accounting for the divergent elasticity estimates in prior studies, drawn from a wide range of labor markets that, themselves, have differences in underlying market concentration.....Compared to the existing literature, these results yield related own-wage elasticity of labor demand estimates for the lowest tercile of labor market concentration on par with the lowest estimates from the minimum wage literature, effects close to zero and statistically insignificant for the middle tercile, and, positive estimates that are larger than most in the literature for the highest tercile. The findings, thus, offer an empirically-founded candidate explanation as to why null employment effects from the minimum wage abound in the literature (due to the averaging of real underlying positive and negative effects), as well as insight into why we may see significant variation in the employment effect of the minimum wage across studies (due, in part, to differing underlying levels of labor market concentration in a studies’ settings). In total, these results suggest that labor market concentration, unmeasured and (empirically) overlooked in prior minimum wage research, is a key variable in moderating the cost of minimum wage policy, and, that the employment effects of a minimum wage increase should be assessed with this heterogeneity in mind. Additionally, the results bolster the evidence for monopsony power in the labor market by demonstrating that key policy effects conform to the predictions of the monopsony model...."
José Azar, Emiliano Huet-Vaughn, Ioana Elena Marinescu, Bledi Taska and Till Von Wachter, "Minimum Wage Employment Effects and Labor Market Concentration," Social Science Research Network, July 10, 2019, https://papers.ssrn.com/sol3/papers.cfmabstract_id=3416016







