Once mortgage backed securities started flooding the markets, the banks and financial institutions also resorted to securitization of the pool of assets to shift the risk to investors in these securities as well as to obtain funds well ahead of the scheduled tenor of these assets. This implied that originators/issuers could repeatedly re-lend a given sum, greatly increasing their fee income and providing a multiplier effect of the underlying notional. Securitization resulted in a secondary market for mortgages, and the lenders were no longer required to hold them to maturity. With increasing securitization deals being struck, and the resultant transfer of default risk, the issuers lowered their underwriting practices to increase their loan disbursements.
The flair for securitization i.e. mortgage backed securities accelerated in the 1990s and total amount of mortgage-backed securities issued tripled between 1996 and 2007, to $7.3 trillion. Alan Greenspan has commented that credit crisis cannot be blamed on sub-prime mortgages alone, but rather on the securitization of such mortgages which created a notional far exceeding the actual value of the underlying assets actually available. The credit risk in sub-prime mortgages got passed on to other investors through the securitization mechanism and with a wide arena of investors globally, the impact of the credit crisis is felt on a global level.