Im not economist either, and my eyes looked like krispy kreme donuts when I followed that link, so I couldnt begin to tell you what was wrong or right about those figures. Since we are just article dropping now, let me drop a few.
http://www.cato.org/pubs/tbb/tbb-0302-13.pdf
http://www.house.gov/jec/fiscal/tx-grwt ... agtxct.htm
http://www.ncpa.org/pdfs/st159.pdf
Theres plenty more that all say the same thing, I basically googled "tax revenue related to tax rates" and walked down the list, every hit was pretty much agreeable.
Helio - Im sure you were making a broad general statement, which is fine, just as long as we realize, not all economist agree on any point, let alone this one in particular, then the story becomes, what evidence to you give the most weight, and what do you deem conjecture.
Heres the thing, people look out for their own first, and thats fine, thats what makes the capitalist system work, this system is most compatible with human nature. I say this to point out, the goal of the government is to strike a balance with tax rates. The higher the rate, the more likely it costs a company or individual less to shelter that money somewhere else. If however our tax rates are set at such that it costs more for the money to be sheltered elsewhere, then the money comes back here, to work in OUR system. This is why the inverse relationship of tax rates and revenues exists. Upon examining some of these studies, and I admit I sorta of perused them rather than crammed them, but it seems the inverse correlation is stronger the more drastic the cut. The cuts in the 20's that took the highest rate from 77% down to 28% made revenues skyrocket. But when the hike or cut is minute, perhaps the effect is a bit more muffled in the numbers. This cut we are talking about now is only an average of 3% at each bracket, so the increase/decrease of revenues is more likely non-perceivable when looking at fudgie graphs and charts.