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Subprime mortgage crisis
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Cover of the 20 October 2007 issue of The Economist showing an image related to a Credit crunch caused by the subprime mortgage crisis. [1]
A diagram of the elements of the subprime crisisThe subprime mortgage crisis is an ongoing economic problem manifesting itself through liquidity issues in the banking system owing to foreclosures which accelerated in the United States in late 2006 and triggered a global financial crisis during 2007 and 2008. The crisis began with the bursting of the US housing bubble[2][3] and high default rates on "subprime" and other adjustable rate mortgages (ARM) made to higher-risk borrowers with lower income or lesser credit history than "prime" borrowers. Loan incentives and a long-term trend of rising housing prices encouraged borrowers to assume mortgages, believing they would be able to refinance at more favorable terms later. However, once housing prices started to drop moderately in 2006–2007 in many parts of the U.S., refinancing became more difficult. Defaults and foreclosure activity increased dramatically as ARM interest rates reset higher. During 2007, nearly 1.3 million U.S. housing properties were subject to foreclosure activity, up 79% from 2006.[4] As of December 22, 2007, The Economist estimated subprime defaults would reach a level between U.S. $200–300 billion.[5]

The mortgage lenders that retained credit risk (the risk of payment default) were the first to be affected, as borrowers became unable or unwilling to make payments. Major banks and other financial institutions around the world have reported losses of approximately U.S. $240 billion as of April 18, 2008 as cited below. Owing to a form of financial engineering called securitization, many mortgage lenders had passed the rights to the mortgage payments and related credit/default risk to third-party investors via mortgage-backed securities (MBS) and collateralized debt obligations (CDO). Corporate, individual and institutional investors holding MBS or CDO faced significant losses, as the value of the underlying mortgage assets declined. Stock markets in many countries declined significantly.

The widespread dispersion of credit risk and the unclear effect on financial institutions caused lenders to reduce lending activity or to make loans at higher interest rates. Similarly, the ability of corporations to obtain funds through the issuance of commercial paper was affected. This aspect of the crisis is consistent with a credit crunch. The liquidity concerns drove central banks around the world to take action to provide funds to member banks to encourage the lending of funds to worthy borrowers and to re-invigorate the commercial paper markets.

The subprime crisis also places downward pressure on economic growth, because fewer or more expensive loans decrease investment by businesses and consumer spending, which drive the economy. A separate but related dynamic is the downturn in the housing market, where a surplus inventory of homes has resulted in a significant decline in new home construction and housing prices in many areas. This also places downward pressure on growth.[6] With interest rates on a large number of subprime and other ARM due to adjust upward during the 2008 period, U.S. legislators and the U.S. Treasury Department are taking action. A systematic program to limit or defer interest rate adjustments was implemented to reduce the effect. In addition, lenders and borrowers facing defaults have been encouraged to cooperate to enable borrowers to stay in their homes. The risks to the broader economy created by the financial market crisis and housing market downturn were primary factors in several decisions by the U.S. Federal reserve to cut interest rates and the economic stimulus package signed by President George W. Bush on February 13, 2008.[7][8][9] Both actions are designed to stimulate economic growth and inspire confidence in the financial markets.

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