I don't think that multiplying your parents' wealth is only confined to the already wealthy class.

I make about ten times as much as my mother did, although we are both university educated. The difference is that I can sell my products on the Internet to a much wider audience. That was a serious multiplier which affected a lot of people and businesses, even on the lower end of the scale.

But I am very definitely not a USD-millionaire and likely won't ever be.