Very little of the economy belongs to people who were "born wealthy." Most rich people these days come from upper middle class, cognitive elite families or small business owners, not generational wealth.

The most important number is that 50% of consumer spending is attributable to the top 10%. That's Google engineers driving up the price of everything from housing, to cars, to Disney World tickets. The income levels of this group has grown several times faster since 1970 than the median income. That directly hurts the middle class, which is out-competed for the same scarce resources.