This strikes me as likely to be just a delayed propagation of the increase in upward mobility seen in the post-war years. It seems entirely reasonable for that to take a couple of generations of people building on their parent's wealth accumulation to propagate upwards to the very top.
How many of those people's success could you trace back to the GI bill? Gates' father attended university because of it, for example.
How many of those people's success could you trace back to the GI bill? Gates' father attended university because of it, for example.