In this question, which is kind of politcally charged in the US, I ask the theoretical and experimental question "Do higher taxes lower economic growth?": Does a tax increase on high incomes slow down economic growth? .
Here is an excerpt of the deleted answer:
It is true in an ideal free efficient market, and it is only true to the extent the market being taxed is efficient. But since an efficient market has no rich people, all incomes are equal in an efficient market, this statement is really never true.
What I said above is not said by any economist, at least not anymore, but it is supported by the U.S. data. This shows growth increasing with higher marginal tax rates on the upper brackets, consistently for at least as long as we have reliable data, and supposing the rates are not so high that people begin to engage in tricks and tactics to shift their money around to untaxable form.
This was common wisdom in the heyday of Keynsianism, from 1932-1978. Anyway, Sklivvz deleted it, I don't like that. It's a fine answer, just downvote it or supply another answer if you don't like it. Also, it is wrong to delete answers because you don't like their politics, and if someone gave a better answer with better data, I could actually change my mind.