Thirty years ago there were more skilled people than there were available jobs. Employee turnover was approximately 4%, most of which was involuntary or business economics driven.
Today the employment landscape is much different. Educated and skilled workers are in short supply and average turnover is more than 10%, with the best and brightest being the most mobile. Offshore outsourcing and contracting is now the business norm for all but the most proprietary and differentiated business processes.