Exploiting minimum-wage variation within multi-state commuting zones, we document a negative relationship between minimum wages and firm variety in the U.S. restaurant and retail-trade industries. To explain this finding, we construct a heterogeneous-firm model with a monopsonistic labor market...

Dube, Lester, and Reich (2010) argue that state-level minimum wage variation can be correlated with economic shocks, generating spurious evidence that higher minimum wages reduce employment. Using minimum wage variation within contiguous county pairs that share a state border, they find no...