How is it that concentrating wealth in private pools is better than spreading it around?

> the corporations they create and invest in generate massive amounts of tax revenue

Economic activity does generate tax revenue, billionaires generate economic activity. But if we took the billions (leave them millions, gready as they are) and spread it around it would have the opportunity to generate much more economic activity

The concentration of wealth, and the resulting concentration of income and widespread middle class impoverishment is catastrophic for our economy.

It is why, in real terms, incomes have been static for thirty years whilst the size of the economy has roughly doubled