It starts with Charles Murray, but we already know what he thinks. And although Kevin Carey's essay will appear later, we know what he thinks, too. I'm curious how Bryan Caplan will weigh in. We know he's a big fan of the signaling model, but presumably he will give us a bit more to chew on, maybe even including some evidence. The essay I'm most looking forward to is Pedro Carneiro's. He's done some work with Heckman, and he seems to be pretty sharp.