<i>If they're stashing it under their mattress, I don't think they'd have gotten rich in the first place. If they've got it invested in stocks or bonds or even banks, then it's not idle and doing nothing. It's helping other people finance their businesses, buy houses, whatever. But it's definitely doing something useful. In fact, it's doing something so useful that the people using the money are willing to rent it from them.</i><p>You are absolutely incorrect. They aren't doing this. They are pulling out of the US economy and putting them in Euros, gold, or Chinese factories. Did you somehow forget the complaints of a credit crunch that banks weren't lending any money?<p>Do you really think they are dumb enough to keep investing in the US when dollars are being printed non-stop? If so you are way off base.<p><i>If there were no argument, you wouldn't be seeing arguments from prominent economists like Greg Mankiw, Bryan Caplan, and Tyler Cowen. And indeed, they've got good arguments. The idea that burning through money to stimulate the economy comes from the Keynesian tradition -- but we know from the 70's double-shot of inflation and unemployment that the Keynesian model is wrong (the question is, "just how wrong?").</i><p>Then why aren't they the ones making the decisions if they are so correct? And the government doesn't simply just spend money for the sake of spending it. It usually (not always of course) goes into projects that benefit the public for decades such as better roads, power, and homes.<p>And Keynesian model being wrong because of the 70's? That is simply naive. Inflation was due to fears of Opec increasing oil prices and moving off the gold standard. Inflation was already rising when Nixon implemented his limits on wage/price increases. US Debt as a fraction of the GDP was even decreasing during this period.<p><a href="http://g-ecx.images-amazon.com/images/G/01/askville/4889596_8620368_mywrite/us_debt_from_1940.gif" rel="nofollow">http://g-ecx.images-amazon.com/images/G/01/askville/4889596_...</a><p>Describing this as Keynesian is absolutely inane.