Subprime mortgage crisis

The subprime mortgages crisis arose from defaults on the United States mortgage markets, and  led to the global 2007-2008 financial crisis.

Glossary
For definitions of the terms shown in italics  in this article, please see the glossary.

Timeline
The Timeline subpage lists the major events of the crisis with links to contemporary news reports.

The Crisis
Unexpected defaults by the holders of some mortgages led to general  uncertainty about the value of mortgage-backed securities. Operators in the financial markets became reluctant to  lend money  on the security of such assets, placing holders of those securities in difficulties. There developed a loss of confidence in organisations  that were suspected of being vulnerable to the falling value of their holdings of mortgage-related securities, and that created a widespread financial crisis.

Among the factors that are considered to have contributed to the development of the crisis are the conduct of monetary policy, the inflow of funds from abroad, the creation of new ways of financing mortgages, the policies adopted by providers of mortgage finance, and the consequent behaviour of the housing markets.

Monetary policy
There is evidence of a connection between  the subprime crisis and the Federal Reserve Bank's conduct of monetary policy. Since the 1980s, the Bank's monetary policy had successfully stabilised the American Economy - and its housing market - by the application of the "Taylor Rule" under which  changes to the bank's discount rate had been related to the spare capacity in the economy. During the period from 2003 to 2006, however, the discount rate was held well below the level suggested by that rule. The author of the rule, Professor John Taylor of Stanford University, has given an account of the consequences of that departure . He argues that those low interest rates helped to foster an extraordinary surge in the demand for housing, and that the eventual fall in housing prices would have been less steep had the Taylor rule been followed.

Housing market developments
In response to the surge in the demand for housing in the period 2003 to 2006, the annual rate of growth of  house prices rose to  ten percent  in the fourth quarter of 2004 and continued at that average rate for two years, reaching twenty  percent at times. Expectations of price increases further accelerated the demand for housing, putting further upward pressure on prices. With the consequent development of a major "housing bubble", there was a fall in the number of defaults and foreclosures  of subprime mortgages, leading  to increases in the  credit ratings of mortgage-backed securities. Those increases turned out to be transitory, however: when interest rates returned to more normal levels in 2007, the demand for housing fell sharply,  and increases in subprime mortgage defaults led to substantial write-downs in their ratings.