The world of e-business is a rapidly changing environment.

The train is running at express speed.

It might be urged, at this point, that the period under discussion was one of rapid development in naval technique.

Yet over periods more than a quarter of a year or a year, even rapid productivity growth has usually gone hand in hand with growing, not declining, employment.

About a third of America’s physicians are now women, as are 45 percent of associates in law firms—and both those percentages are rising fast.