http://blog.skepticallibertarian.com/2013/02/25/remedial-eco...
The employment effect of the minimum wage is one of the most studied topics in all of economics. This report examines the most recent wave of this research – roughly since 2000 – to determine the best current estimates of the impact of increases in the minimum wage on the employment prospects of low-wage workers. The weight of that evidence points to little or no employment response to modest increases in the minimum wage.
If this is the case, you'd think employers would have an incentive to raise wages on their own without requiring a law.
If you want to help improve standards of living around the world, reduce immigration restrictions so that people can move from countries with few economic opportunities to other countries where there are more opportunities.
Personally I agree with most of what Bryan Caplan has written on the topic.