At what point are the amount of taxes on the rich considered "fair"?
LIberals and Democrats in the US are constantly arguing that the rich are not paying their "fair" share. What is that ideal rate/process? At what point is it "fair"? I don't just mean how would they tweak it, but what would be their ideal end goal at which they would say, "Yes, those taxes are fair"? I am looking for genuine answers, so please withhold snarky comments about taxes, politicians, rich and such.
Two proposals from people below so far:
1) A graduated tax rate where all income over $500,000 is taxed at 10 times the tax rate for the lowest income earners.
2) A 91% tax on all income earned over $2,000,000.
Would Liberals and Democrats consider either one of these "fair"?