If you had taxation at a 95 percent level how much revenue would you generate?

Having 95% as the top rate does not generate a lot of revenue. At one time in the United States the top rate was 96% starting at $100,000. One man was offered a job at a different company for $200,000 more than he was making which would have doubled his salary. He refused to move for $8,000 dollars a year, which is what he would have made after taxes. A large amount of people's incomes came as untaxed fringe benefits. When the government reduced the top tax rates, the top incomes rose and tax revenue actually increased.

When everyone pays a 95% tax rate, barter replaces money.