From jstor:
In a 2003 paper in The Journal of Human Resources, economists David Neumark [professor of economics at UCI] and Scott Adams looked for the effects of the laws on various economic outcomes. … Their data shows that living wage laws have “positive and significant” effects on pay for low-wage workers, but they do moderately reducing the employment rates of low-skilled workers.
 
For the full story, please visit http://daily.jstor.org/living-wage-laws-work/.