Source:
San Francisco Bay GuardianFor three decades we have conducted a massive economic experiment, testing a theory known as supply-side economics. The theory goes like this: Lower tax rates will encourage more investment, which in turn will mean more jobs and greater prosperity — so much so that tax revenues will go up, despite lower rates.
... For the past decade, we have doubled down on this theory of supply-side economics with the tax cuts sponsored by President George W. Bush in 2001 and 2003, which President Barack Obama has agreed to continue for two years.
You would think that whether this grand experiment worked would be settled after three decades. You would think the practitioners of the dismal science of economics would look at their demand curves and the data on incomes and taxes and pronounce a verdict, the way Galileo and Copernicus did when they showed that geocentrism was a fantasy because the Earth revolves around the sun (known as heliocentrism). But economics is not like that. It is not like physics with its laws and arithmetic with its absolute values.
... How long does it take to conclude that a policy has failed to fulfill its promises? And as you think of that, keep in mind George Washington. When he fell ill his doctors followed the common wisdom of the era. They cut him and bled him to remove bad blood. As Washington's condition grew worse, they bled him more. And like the mantra of tax cuts for the rich, they kept applying the same treatment until they killed him.
Read more:
http://www.sfbg.com/2011/04/12/failed-experiment