How about a tax rate market?

I'm wondering what kind of research has been done on tax rate markets, i.e.: create a market in which people buy equity in government revenues in exchange for tax rate reductions. So for example, the value of the "-5% cap gains" market would represent the anticipated increase in government revenues were the capital gains tax reduced by 5%. This may be a solution to removing political barriers to tax cuts (perhaps due to ideology, but more likely due to extreme risk aversion).