Does defining local labor markets differently change minimum wage employment effects?
Core argument: Using multi-state commuting zones instead of contiguous county pairs, the authors estimate the cumulative effect of a minimum wage increase on U.S. restaurant employment reaches an elasticity of −0.305 after four years.
Using minimum wage variation within contiguous county pairs sharing a state border, [previous authors] find no relationship between minimum wages and employment in the U.S. restaurantindustry. 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. Notice that although the cumulative effect of a minimum wage change on restaurant employment is stable around zero when using county pairs, the story is very different when using pairs from multi-state commuting zones. In the latter case, the cumulative effect is near zero two quarters before the minimum wage change, but then it gets into a solid negative trend, reaching a significant elasticity of −0.305 after four years.Therefore, a simple switch of the definition of local economic area—from pairs of contiguous counties sharing a state border, to multi-state commuting zones that are actually defined as local economic areas—dramatically overturns DLR’s finding of a near zero long-term effect of minimum wages on employment in the restaurant industry.


