Piketty suggested a top 'wealth tax' rate of 2% for valuations over something like US$ 1B: * https://en.wikipedia.org/wiki/Capital_in_the_Twenty-First_Century

Piketty suggested a top 'wealth tax' rate of 2% for valuations over something like US$ 1B: * https://en.wikipedia.org/wiki/Capital_in_the_Twenty-First_Century https://en.wikipedia.org/wiki/Capital_in_the_Twenty-First_Ce... Given the general trend of capital growth being higher than economic growth, that would be probably be small amount of shares at any given time, and would take a while before they deplete having large control over their companies.