What’s Across the Border? Re-Evaluating the Cross-Border Evidence on Minimum Wage Effects

Dube, Lester, and Reich (2010) argue that state-level minimum wage variation correlated with economic shocks generates spurious evidence that higher minimum wages reduce employment. Using minimum wage variation within contiguous county pairs sharing a state border, they find no relationship between minimum wages and employment in the U.S. restaurant industry. Using the same research design, we show that this result is overturned if we use instead multi-state commuting zones, which provide superior definitions of local economic areas. These contrasting results are explained by a positive bias in the county-pair specification when using pairs formed by counties from different commuting zones.