This site looks, a bit shady, but it does give figures: http://www.blacklistednews.com/view.asp?ID=6397 http://www.blacklistednews.com/view.asp?ID=6397 > Tota

This site looks, a bit shady, but it does give figures: http://www.blacklistednews.com/view.asp?ID=6397 http://www.blacklistednews.com/view.asp?ID=6397 > Total U.S. credit card debt reached almost $800 billion in November 2007 In contrast, the US GDP is about $14 trillion, so credit cards probably have some inflationary effect (GDP isn't the right statistic, what's needed is some measure of the total money supply, but I'm not sure how that's done.)