My best guess is not to 8% over the long term. That is one of the reasons I think the proposed flat taxes and fair taxes will become just as complex over time. Higher rates will cause tax avoidance steps which will then require regulations.
not to exceed 8%
Between your #52 (behavioral economics, facts and evidence) and my #54 (slavish devotion to Old Testament law), we pretty much ended up about at the same place. Heh. I find that gratifying.