In this report
http://www.pbs.org/newshour/bb/business/jan-june12/makingsense_01-11.html
Paul Solmon discussed the Laffer curve, and several economists suggest that the optimum tax revenue is higher on the curve than Laffer and the trickle-downers say. Rich people will work harder to make more money, if they have to pay more in taxes. On the other hand, charging more taxes to the less wealthy trying to start businesses, will hurt them and the economy.
Excerpt:
PETER DIAMOND, Massachusetts Institute of Technology: If you want to shoot tax dollars in the direction of business creation, you have got to ask, who is it that's having trouble getting financing? It's not the high-earners. It's further down the income distribution.
PAUL SOLMAN: So, if I understand you correctly, you're turning this argument on its head in a way. And you'd say, if your objective is to create more jobs, you might want to lower the taxes on people who are further down the income ladder.
PETER DIAMOND: Those are the people having trouble starting businesses. The top 1 percent have wealth. They have high earnings. They have an ability to borrow. If they want to do a startup, they're not going to be limited by the fact that they're paying a slightly higher or somewhat higher tax on their earnings.
PAUL SOLMAN: Now, Diamond buys the basic concept of the Laffer Curve and agrees that tax rates should be kept below the point at which they start to discourage work.
PETER DIAMOND: You never want to go into that part of the curve.
PAUL SOLMAN: But since he disputes the premise that it's the wealthy who need low taxes to create jobs, he sees little harm in raising their taxes when government really needs the revenue.
PETER DIAMOND: We have a lot of studies, based on the available data, on the relationship between tax rates and the amount of revenue you get. It's very close to certain that the current 35 percent is almost surely below, and comfortably below, what would maximize the revenue. So, I'm very comfortable that the top marginal income tax rate, high 40s, 50s, on up, maybe even into the low 60s.
PAUL SOLMAN: So, according to the data, says Peter Diamond, the Laffer Curve might really look some thing like this. And where would Diamond himself put the top tax rate?
At about 49 percent, still comfortably below the point of maximum tax revenue -- 49 percent or so would have positive economic effects, short-term and long, by financing government investment in infrastructure, in education, in research and development, says Diamond, all key components of economic growth.