次貸危機
Financial institutions facing losses may then reduce the availability of credit, and increase the cost of accessing credit by raising interest rates. In some cases lenders may be unable to lend further, even if they wish, as a result of earlier losses. If participants themselves are highly leveraged (i.e., carrying a high debt burden) the damage done when the bubble bursts is more severe, causing recession or depression. Financial institutions may fail, economic growth may slow, unemployment may rise, and social unrest may increase. For example, the ratio of household debt to after-tax income rose from 60% in 1984 to 130% by 2007, contributing to (and worsening) the Subprime mortgage crisis of 2007–2008.