What Sandy said. They can raise wages without being legally required to do so. We aren't addressing a maximum wage law. This really makes no sense.
It makes PERFECT sense for Walmart to call for the government to raise the minimum wage, since ALL employers would have to do so.
Walmart retains their profit margins in an environment where the playing field of wage increases is universally applied by government decree...and the typical 'poor' Walmart shopper has more to spend.