83% tax rate?

This is an Economist article that is likely to get a few people riled up:

That is relatively uncontroversial. But their other finding is likely to raise a few eyebrows. They reckon that if the tax system were reformed to make evasion impossible, the top tax rate might be able to rise to as much as 83%—that is, to levels last seen in the 1960s—without hurting the economy. This is because people do not seem greatly to adjust how much they work when tax rates change. Higher top rates may also discourage big earners from spending too much of their time trying to bargain for a larger share of the overall pie.

Yes, it's time to reform the US tax code.