The sentences below have been mixed up. Please put them in the correct order. 
(1) When this burst, millions of people lost their homes, which for many had contained their savings. (2) These mortgages had been developed to allow higher-risk poorer families to buy their own homes, but this contributed to a property price bubble.(3) Many economists now argue that there is a maximum level of home ownership which should not be exceeded.(4) All these claims were challenged by the economic crash of 2008, which was largely caused by defaults on American sub-prime mortgages.(5) Even households that had positive equity still felt poorer and reduced their spending.(6) Others were trapped in their houses by negative equity, in other words their houses were worth less than they had paid for them.