There's a fascinating analysis of the actual effects of very high marginal tax rates in Thomas Piketty's 'Brief History of Equality': it's 'predistribution'. Companies simply stop paying out very high salaries, dividends etc, and instead reinvest profits - and this was in fact one of the reasons we had both higher growth and higher marginal tax rates together in the post-war period, and why when Reagan and Thatcher came in and started to lower tax, it gradually strangled growth.
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