Labor market concentration and heterogeneous effects on wages: Evidence from Japan*

This study provides empirical evidence of the impact of labor market concentration on wages. We find that (1) wages are suppressed in more concentrated labor markets, (2) labor rigidity is associated with wage responsiveness to labor market concentration, (3) the impact of labor market concentration on wages is smaller for firms with more competitive downstream product markets, and (4) greater job opportunities outside the manufacturing sector weaken the relationship between concentration and wages. In sum, our findings indicate that labor rigidity and the degree of competition in downstream product markets, as well as outside options, affect the relationship between market concentration and wages.