http://www.epi.org/publication/the-high-road-seattle-labor-market-and-the-effects-of-the-minimum-wage-increase-data-limitations-and-methodological-problems-bias

http://www.epi.org/publication/the-high-road-seattle-labor-market-and-the-effects-of-the-minimum-wage-increase-data-limitations-and-methodological-problems-bias-new-analysis-of-seattles-minimum-wage-incr/ http://www.epi.org/publication/the-high-road-seattle-labor-m... [quote]The study excludes an important group of workers, representing roughly 40 percent of the workforce: those working for employers with businesses in multiple locations. By omitting all multi-location businesses, such as chains, in Seattle, the authors bias their results toward showing job loss if there has been a shift in employment from small, single-location establishments toward larger firms with multiple locations.[/quote]