Economists are now finding that as more women move into a profession, the pay goes down. Similarly, when computer programming moved from a female dominated profession (early days) to male dominated (now) the pay went up. Medical fields that have higher proportions of women have lower pay. Along these lines, as college skews more female (college grads are like 60/40 female/male now) the "college grad" professions are having a declining wage premium compared to non college grad jobs.