I am using the highest federal marginal income rate as a proxy for effective rates. There are other factors that determine effective rates like AMT and the social security cap, and I think we will launch those markets at some point if liquidity builds.
Peter, you are right and the first step is to just be able to insure against taxes. This is what I'm trying to do over at Intrade:
http://www.intrade.com/index.jsp?request_operation=trade&request_type=action&selConID=575719
I am using the highest federal marginal income rate as a proxy for effective rates. There are other factors that determine effective rates like AMT and the social security cap, and I think we will launch those markets at some point if liquidity builds.