Someone enlighten me, how can the author talk about a marginal tax rate for the entirety of ones income? Isn't a marginal rate by definition the rate which applies to earnings above a specific benchmark (thereby providing no disincentive to cross it)?
The "marginal" think really does throw this off. The "marginal rate" means the amount you'll be taxed for the next dollar you earn. So this tells us little about the rate that each person already paid for the amount below the margin, the "body" of earnings, if you will. Actually, the more I think about it, the more I think that the idea of a flat marginal rate is a good thing: that means there's little disincentive t…
http://en.wikipedia.org/wiki/Fundamental_theorem_of_calculus