text:  This is APM. I'm Stephen Dubner. On the next Freakonomics Radio, the economics of Broadway are very tough, but things are working out for the new hit show, Stereophonic. We just keep saying over and over again, when will it slow down? When will this slow down? When will it sort of stop? And it just has not yet. And can the unlikely success of Stereophonic help change the grim future of the theater? We are more than just a luxury. That's next time on Freakonomics Radio. Beginning this evening at 7,