Fringe ideas are fringe ideas until they aren’t. When reformers started to push for child-labor laws around a century ago, it looked like an outside shot. So did a $15 minimum wage, before Vice President Joe Biden and New York Governor Andrew Cuomo took up the cause a few weeks ago. (It still does—and some say it's a bad idea in the first place—but it’s come a long way in a short time.) Not to be outdone, Berkeley, California, is now pressing to require a $19 hourly wage, and one CEO promised employees a $70,000 minimum salary earlier this year.
