Um... I dont know much about this Ponzi scheme, but agree that capitalism is like a ponzi scheme, in that people buy/sell stocks/commodities on the basis of what they think it will be worth in a period of time. When people stop buying the scheme (stockmarket) collapses, and similar to the oil bubble 6 months ago it only worked because it kept drawing more and more people in, as soon as confidence fell out the market and people didnt want to buy, those with positions on oil lost big style. A ponzi is similar, as long as people think there is money to be made and keep investing then the scheme works fine, its only when nobody else wants to buy invest (buy) that it falls appart.