Libertarian (or classical liberal) law professor Richard Epstein's column this week is about the minimum wage:
Nor is the case for a higher minimum wage advanced by insisting, as the White House does, that "paying workers more can also improve motivation, morale, focus, and health, all of which can make workers more productive." Indeed, these considerations cut exactly the opposite way. If increased wages alone increased productivity, there would be no need for federal intervention: Employers would have all the incentive they need to raise wages voluntarily. That is how markets work.