How high is too high, for the minimum wage?

Dylan Matthews, in his wrap-up of a Democratic primary debate, says that his “off-the-record conversations with left-leaning Democratic economists” indicate that many of them “express grave concern about the $15-an-hour figure, about the danger that this time we might be going too far.” His Vox colleague Timothy Lee is tagged in to make the same argument in another post.

This despite the fact that Hillary Clinton has now apparently joined Bernie Sanders in endorsing the fifteen-dollar minimum, going back on her previous unwillingness to go above twelve dollars.