Note to KiwiPundit

What I find rather telling is all those "after about 5 years", and "after about 20 years" your argument is littered with. You can indeed prove anything with suitably optimistic baseline assumptions and the miracle of compound interest over a long enough time period. Meanwhile, the fact remains that cutting taxes on the wealthy will lead to an immediate reduction in government income, and a consequent reduction in government services until the magic payoff point is reached.

As someone who cares more about government services (and equality, and social justice, and actual human welfare) than economic growth, I don't find your argument terribly compelling.