Put your ear to the ground near any business school campus, and you will hear the sound of another bubble about to pop. The MBA will soon be joining equities and house titles in the museum of formerly overvalued pieces of paper.

The problem in the short term begins, like so many other fine things these days, in the financial sector. Over the past two decades, about one-third of graduates from top business schools took jobs in finance. But banking will never be what it once was (we can only hope), and consulting—the other major consumer of MBAs—is reeling, too. Couple declining demand with the fact that at the onset of a recession, the supply of students actually rises as the prospectively unemployed look for ways to fill in gaps in their CVs, and "shorting" the MBA looks like a compelling near-term trading strategy.