Now that I have some free time, it's time for me to enter the debate.
The most important thing that needs to be understood is how taxes affect spending, saving, and people's overall outlook of things. This quote sums things up nicely:
Taxes enter many decisions, but the two most important are probably that they discourage work, since they lower the aftertax return from work, and they discourage saving and investment, since they lower aftertax returns. (A third, which we will not explore here, is that taxes distort investment decisions by taxing different types of capital unequally. Housing, for example, gets a free ride.) We know that the countries that invest the most (measured as the ratio I/Y) also grow the fastest, on average, so maybe this is important (or maybe the causality goes the other way, with the US investing less because it has fewer good opportunities).
Basically, this means that less taxes = more money for workers, leading to more saving and investments that stimulate the economy, since when people have more money, more money is spent on goods and services. Also important is the labor aspect affected by lower taxes. Again, a quote will do:
A lower tax rate on wage income should increase the labor supply. Given the labor demand function, this increase in labor supply will increase employment, reduce the pre-tax real wage and increase the post-tax real wage.
Lower taxes = more $$$ = more incentive to work, even if it's just a little bit more.
This is basically what common sense can tell us about economics. However, what needs to be determined is how big of an effect the tax cuts have, and what else needs to be changed to compliment it. One thing that definitely affects how much tax revenue is needed is how much the U.S. Federal Government is spending, because more spending means more money is needed to make up for this spending, meaning higher taxes. As can be seen by the graph below, overall government spending has increased dramatically recently, doubling in just ten years!
(
http://imageplay.net/img/m7Gbd136331/US_Spending_00_10.bmp) (
http://www.usgovernmentspending.com/downchart_gs.php?year=2000_2010&view=1&expand=&units=b&fy=fy11&chart=F0-fed&bar=0&stack=1&size=l&title=&state=US&color=c&local=s)If the federal government lowered their costs or eliminated outdated programs that served little or no purpose, it could generate more net income that could be used for things like paying off our $15 trillion debt to foreign countries. After this, we could lower the tax rates to a level that would facilitate more economic growth.
Of course, we also need to move more businesses back into the U.S.A.
Due to lower wages in certain countries (and in some cases, fewer laws to inhibit production), 12,000 - 15,000 jobs per month are being transferred from American citizens to people in China, Taiwan, etc., in exchange for cheaper goods to sell at U.S. markets. Sure, this is fine in the short run, but in the long run, there'll be next to no one working in the U.S. if this trend continues, and we'll have to buy all of our goods from other nations with money we don't have.
By bringing more jobs back to the U.S., more people will be working and earning money, facilitating economic growth and getting less people off of costly aid programs like food stamps programs. This, in turn, will reduce the need for certain government programs, whose budgets will be cut down enough to need less taxes to create a suitable amount of net income.
Additional Sources:
http://www.cfr.org/pakistan/trade-outsourcing-jobs/p7749 (
http://www.cfr.org/pakistan/trade-outsourcing-jobs/p7749)
Not sure if all of this relates to the original debate, but it's still useful for understanding economics in general.