It is somewhat counter-intuitive, but a lot of good economics has that property.
The top 1% of US earners now command a far higher share of the country’s income than they did 40 years ago. This column looks at 18 OECD countries and disputes the claim that low taxes on the rich raise productivity and economic growth. It says the optimal top tax rate could be over 80% and no one but the mega rich would lose out.
Piketty, Saez and Stantcheva: Taxing the 1% – Why the Top Tax Rate Could be Over 80% — guest posting at Naked Capitalism.