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US sub-prime mortgage crisis : ウィキペディア英語版
Subprime mortgage crisis

The United States (U.S.) subprime mortgage crisis was a nationwide banking emergency that coincided with the U.S. recession of December 2007 – June 2009.〔(US Business Cycle Expansions and Contractions ), NBER, accessed August 9, 2012.〕 It was triggered by a large decline in home prices, leading to mortgage delinquencies and foreclosures and the devaluation of housing-related securities. Declines in residential investment preceded the recession and were followed by reductions in household spending and then business investment. Spending reductions were more significant in areas with a combination of high household debt and larger housing price declines.
The expansion of household debt was financed with mortgage-backed securities (MBS) and collateralized debt obligations (CDO), which initially offered attractive rates of return due to the higher interest rates on the mortgages; however, the lower credit quality ultimately caused massive defaults.〔Lemke, Lins and Picard, ''Mortgage-Backed Securities'', Chapter 3 (Thomson West, 2013 ed.).〕 While elements of the crisis first became more visible during 2007, several major financial institutions collapsed in September 2008, with significant disruption in the flow of credit to businesses and consumers and the onset of a severe global recession.〔
There were many causes of the crisis, with commentators assigning different levels of blame to financial institutions, regulators, credit agencies, government housing policies, and consumers, among others.〔(Financial Inquiry Commission-Final Report-Retrieved February 2013 )〕 A proximate cause was the rise in subprime lending. The percentage of lower-quality subprime mortgages originated during a given year rose from the historical 8% or lower range to approximately 20% from 2004 to 2006, with much higher ratios in some parts of the U.S.〔Michael Simkovic, (''Competition and Crisis in Mortgage Securitization'' )〕〔(Harvard University-The State of the Nation's Housing-2008-See Figure 4-Page 4 )〕 A high percentage of these subprime mortgages, over 90% in 2006 for example, were adjustable-rate mortgages. These two changes were part of a broader trend of lowered lending standards and higher-risk mortgage products.〔〔(Michael Burry-Vanderbilt Magazine-Missteps to Mayhem-Summer 2011 )〕 Further, U.S. households had become increasingly indebted, with the ratio of debt to disposable personal income rising from 77% in 1990 to 127% at the end of 2007, much of this increase mortgage-related.
When U.S. home prices declined steeply after peaking in mid-2006, it became more difficult for borrowers to refinance their loans. As adjustable-rate mortgages began to reset at higher interest rates (causing higher monthly payments), mortgage delinquencies soared. Securities backed with mortgages, including subprime mortgages, widely held by financial firms globally, lost most of their value. Global investors also drastically reduced purchases of mortgage-backed debt and other securities as part of a decline in the capacity and willingness of the private financial system to support lending.〔 Concerns about the soundness of U.S. credit and financial markets led to tightening credit around the world and slowing economic growth in the U.S. and Europe.
The crisis had severe, long-lasting consequences for the U.S. and European economies. The U.S. entered a deep recession, with nearly 9 million jobs lost during 2008 and 2009, roughly 6% of the workforce. One estimate of lost output from the crisis comes to "at least 40% of 2007 gross domestic product". U.S. housing prices fell nearly 30% on average and the U.S. stock market fell approximately 50% by early 2009. As of early 2013, the U.S. stock market had recovered to its pre-crisis peak but housing prices remained near their low point and unemployment remained elevated. Economic growth remained below pre-crisis levels. Europe also continued to struggle with its own economic crisis, with elevated unemployment and severe banking impairments estimated at €940 billion between 2008 and 2012.〔Benchimol, J., 2014. (Risk aversion in the Eurozone ), Research in Economics, vol. 68, issue 1, pp. 39-56.〕
==Background and timeline of events==

The immediate cause or trigger of the crisis was the bursting of the United States housing bubble which peaked in approximately 2005–2006. An increase in loan incentives such as easy initial terms and a long-term trend of rising housing prices had encouraged borrowers to assume risky mortgages in the anticipation that they would be able to quickly refinance at easier terms. However, once interest rates began to rise and housing prices started to drop moderately in 2006–2007 in many parts of the U.S., borrowers were unable to refinance. Defaults and foreclosure activity increased dramatically as easy initial terms expired, home prices fell, and ARM interest rates reset higher.
As housing prices fell, global investor demand for mortgage-related securities evaporated. This became apparent by July 2007, when investment bank Bear Stearns announced that two of its hedge funds had imploded. These funds had invested in securities that derived their value from mortgages. When the value of these securities dropped, investors demanded that these hedge funds provide additional collateral. This created a cascade of selling in these securities, which lowered their value further. Economist Mark Zandi wrote that this 2007 event was "arguably the proximate catalyst" for the financial market disruption that followed.〔
Several other factors set the stage for the rise and fall of housing prices, and related securities widely held by financial firms. In the years leading up to the crisis, the U.S. received large amounts of foreign money from fast-growing economies in Asia and oil-producing/exporting countries. This inflow of funds combined with low U.S. interest rates from 2002 to 2004 contributed to easy credit conditions, which fueled both housing and credit bubbles. Loans of various types (e.g., mortgage, credit card, and auto) were easy to obtain and consumers assumed an unprecedented debt load.〔(Krugman-Revenge of the Glut )〕
As part of the housing and credit booms, the amount of financial agreements called mortgage-backed securities (MBS), which derive their value from mortgage payments and housing prices, greatly increased. Such financial innovation enabled institutions and investors around the world to invest in the U.S. housing market. As housing prices declined, major global financial institutions that had borrowed and invested heavily in MBS reported significant losses. Defaults and losses on other loan types also increased significantly as the crisis expanded from the housing market to other parts of the economy. Total losses were estimated in the trillions of U.S. dollars globally.
While the housing and credit bubbles were growing, a series of factors caused the financial system to become increasingly fragile. Policymakers did not recognize the increasingly important role played by financial institutions such as investment banks and hedge funds, also known as the shadow banking system. These entities were not subject to the same regulations as depository banking. Further, shadow banks were able to mask the extent of their risk taking from investors and regulators through the use of complex, off-balance sheet derivatives and securitizations. Economist Gary Gorton has referred to the 2007–2008 aspects of the crisis as a "run" on the shadow banking system.〔(Gary Gorton-NBER and Yale-Slapped in the Face by the Invisible Hand: Banking and the Panic of 2007-Updated May 2009 )〕
The complexity of these off-balance sheet arrangements and the securities held, as well as the interconnection between larger financial institutions, made it virtually impossible to re-organize them via bankruptcy, which contributed to the need for government bailouts.〔 Some experts believe these shadow institutions had become as important as commercial (depository) banks in providing credit to the U.S. economy, but they were not subject to the same regulations. These institutions as well as certain regulated banks had also assumed significant debt burdens while providing the loans described above and did not have a financial cushion sufficient to absorb large loan defaults or MBS losses.
The losses experienced by financial institutions on their mortgage-related securities impacted their ability to lend, slowing economic activity. Interbank lending dried-up initially and then loans to non-financial firms were affected. Concerns regarding the stability of key financial institutions drove central banks to take action to provide funds to encourage lending and to restore faith in the commercial paper markets, which are integral to funding business operations. Governments also bailed out key financial institutions, assuming significant additional financial commitments.
The risks to the broader economy created by the housing market downturn and subsequent financial market crisis were primary factors in several decisions by central banks around the world to cut interest rates and governments to implement economic stimulus packages. Effects on global stock markets due to the crisis were dramatic. Between 1 January and 11 October 2008, owners of stocks in U.S. corporations suffered about $8 trillion in losses, as their holdings declined in value from $20 trillion to $12 trillion. Losses in other countries averaged about 40%.〔''Wall Street Journal'' Oct. 11, 2008, p.1〕
Losses in the stock markets and housing value declines place further downward pressure on consumer spending, a key economic engine.〔(NYT – Friedman "Gonna Need a Bigger Boat" )〕 Leaders of the larger developed and emerging nations met in November 2008 and March 2009 to formulate strategies for addressing the crisis. A variety of solutions have been proposed by government officials, central bankers, economists, and business executives. In the U.S., the Dodd–Frank Wall Street Reform and Consumer Protection Act was signed into law in July 2010 to address some of the causes of the crisis.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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