1. It's an historical fact that growth (+ GDP) is higher when tax rates are higher; the reason is its "redistributive effect," a vital component in modern econmies, the world over. Money at the top tends to stagnate, whereas when it's re-distributed it moves rapidly through the economy, in what are called "high monetary velocity points." Increase growth by a percentage point or two, and the impact on revenue is substantial.
2. The calculation focuses only on income from Labor (about 2/3rds) and ignores the impact on income from Capital (1/3) which also need to be increased at the same time, progressively.
FWIW[/QUOTE
Did you just make this up? The "redistributive effect" simply refers to a progressive tax system which transfers wealth from the rich to the poor. Its principle attribute is the perception of "fairness." Economically, it results in a less efficient allocation of resources.
But even if your thesis was correct, how would you determine optimum "high money velocity points" and why wouldn't they be at a 100% taxation level? Also, how would you increase Capital at the same time as you are raising taxes? More government spending and Quantitative Easing?
Hahahahahahaha ...
No; I didn't make it up. It's a vital component in tax policy, in every modern economy in the world, and known to economists as "redistributive effect," which I'll explain right after this:
Right wing fear-mongering firms focus group-tested "wealth redistribution," and came up with that gem, which exploits ignorance of the many minutia in political economics. And it's kinda laughable, since we do not tax wealth, per se. We tax incomes, which benefit from the redistributive effect, increasing wealth, especially for the wealthy.
Back to redistibutive effect, from progressive taxes on income: it mobilizes stagnant capital and moves it back through the economy, creating some momentum on its way back to the top, where it always goes in the end. Thing begin to happen, such as more investor, banking and consumer confidence, with the money flowing around at higher monetary velocity points, greatly improving earnings, especially of the most well off. So the extra few precentage points on their incomes north of $320,000 (about) is easily eclipsed by earnings increases of just 5% or 10%, which is a low average when the economy is growing by 4 or more percent, annually, which higher rates of redistribution have always paralleled, if not more. In the end, the net more, since slightly less of a much bigger number is more than 100% of a lower number, quite often.
And here's why: Lower earners are not paid more when companies do better. They're paid based on labor markets and wage minimums, which do not suddenly improve based on earnings. But higher wage earners and company owners do make more as profits and the economy grow, with bonuses, profit sharing or their S/LL Corp just doing better. And even a saint (S Corp seeing a nice spike in business) might up their worker(s) pay when they're doing better, but ot in parallel with the owner's increase, nor even close.
In re: "fairness," I leave that to preists and philosophers. I merely focus on what's best policy, economically.
Does that clear it up for you?