[Moonman62]

If Laffer's thesis about tax cuts is valid, why did the U.S. economy record the weakest period of economic expansion following the Bush tax cuts of 2001 and 2003?

W's tax cuts were terrible (demand side all the way), but the tax cuts in 2003 that were largely written by the Republicans in Congress, had some supply side and small benefits, and the economy did expand some after that.

[skeeter]

If Laffer's thesis about tax cuts is valid, why did the U.S. economy record the weakest period of economic expansion following the Bush tax cuts of 2001 and 2003?

Lets wait until they expire next year & see what happens.