We should be expecting a smaller proportion of the population to be working in most sub-sectors of the economy each year, as new, innovative areas provide opportunities for relatively inexperienced people with high aptitude to work more productively and earn higher wages. It's fine having people bagging groceries at supermarket checkouts, but that isn't really going to work out in the coming years if those same people are going to be demanding state-of-the-art medical treatments, developed-world retirement benefits and cutting-edge consumer goods.