Subprime assets lost value rapidly between 2007 and 2009. This lowered the value of banks that had exposure to these assets and financial institutions that had exposure to banks that were exposed to subprime risk. Since the assets were hard to value they were not acceptable as collateral. This made banks illiquid and this scared away the suppliers of bank capital. A liquidity crisis turned into a credit crisis for many financial institutions such as WAMU, Wachovia, Lehman and others.

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