The Financial Crisis of 2008 was a global economic collapse triggered by the failure of mortgage-backed securities and related financial instruments, culminating in what is widely described as the worst financial disruption since the Great Depression. It began with the collapse of the U.S. housing bubble and spread through interconnected global financial markets, resulting in the failure or near-failure of major financial institutions, government bailouts, sharp contractions in credit, and a severe recession affecting most of the world's economies. The crisis prompted sweeping regulatory responses and remains a subject of ongoing debate regarding its causes, the appropriateness of policy responses, and the lessons it holds for financial regulation.

Throughout the early 2000s, U.S. housing prices rose sharply, supported by loose lending standards, the proliferation of subprime mortgages, and strong investor demand for mortgage-backed securities (MBS) and collateralized debt obligations (CDOs). Credit rating agencies assigned high ratings to many of these instruments, which were later found to have substantially understated risk. When housing prices peaked in 2006 and began declining, defaults on subprime mortgages rose rapidly, eroding the value of MBS held by financial institutions worldwide.

In 2007, early signs of stress appeared in credit markets. By 2008, the crisis became acute. In March, Bear Stearns was acquired by JPMorgan Chase with assistance from the Federal Reserve. In September, the government-sponsored enterprises Fannie Mae and Freddie Mac were placed into conservatorship. On 15 September 2008, Lehman Brothers filed for bankruptcy - the largest in U.S. history at the time - triggering a global credit freeze. American International Group (AIG) received an emergency federal bailout the following day. Congress passed the Emergency Economic Stabilization Act in October 2008, creating the Troubled Asset Relief Program (TARP), which authorized up to $700 billion to stabilize the financial system. The Federal Reserve undertook unprecedented interventions including near- zero interest rates and quantitative easing. Similar bailouts and stimulus measures were enacted in Europe and elsewhere. For a detailed account of the timeline and policy responses, see Financial Crisis of 2008 - History.

The crisis produced the deepest global recession since the 1930s. U.S. GDP contracted, unemployment rose to 10 percent by October 2009, and household wealth declined sharply due to falling home values and equity prices. Global trade contracted significantly. Iceland's banking system collapsed entirely. Several European nations - Greece, Ireland, Portugal, Spain, and Cyprus - required international bailouts in the years following. Millions of households in the U.S. lost their homes to foreclosure. The recovery was prolonged and uneven, with many working-class and middle-class households recovering more slowly than financial markets.

There is broad agreement that the crisis involved the intersection of several factors: lax mortgage underwriting standards, excessive leverage in financial institutions, flawed risk models, failures of credit rating agencies, and inadequate regulatory oversight. Beyond this general outline, causal emphasis is contested. Some accounts center on deregulation and private-sector risk-taking; others emphasize government policy distortions including housing subsidies, mandates to expand homeownership to lower-income borrowers, and the implicit government guarantee behind Fannie Mae and Freddie Mac. Still others focus on the Federal Reserve's low-interest-rate policy in the early 2000s as a driver of the housing bubble - a position associated with economists including John Taylor, Anna Schwartz, and Lawrence White, which holds that artificially cheap credit was the primary condition enabling the bubble's formation. Debate continues over the relative weight of each factor. See Financial Crisis of 2008 - Debate for a structured treatment of these disagreements.

The government bailouts and stimulus measures adopted in 2008-2009 remain contested. Proponents argue they prevented a systemic collapse and a second Great Depression. Critics across the political spectrum contend that the bailouts socialized losses while leaving gains private, rewarded reckless institutions, entrenched moral hazard, and imposed the costs of financial-sector failure on ordinary taxpayers and workers. The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 was the primary legislative response; its adequacy, scope, and effects are themselves disputed. See the Viewpoints section below for links to the major positions on these questions.

There is broad consensus among economists that the crisis resulted from a combination of excessive leverage, inadequate risk management, and regulatory gaps. The Economics Consensus page summarizes areas of professional agreement. There is no comparable consensus on the primary cause, the appropriate counterfactual policy, or the long-term effects of the regulatory response.

The following viewpoints represent distinct interpretive and normative positions on the crisis and its policy responses:

• Deregulation Caused the Crisis - emphasizes the removal of financial-sector guardrails, particularly the erosion of Glass-Steagall and the Commodity Futures Modernization Act, as enabling conditions for systemic failure.
• Government Intervention Created the Crisis - holds that federal housing policy, implicit guarantees for GSEs, and Federal Reserve rate policy inflated the bubble and distorted private risk-taking.
• Monetary Policy Caused the Crisis - argues that the Federal Reserve's low-interest-rate policy in the early 2000s was the primary condition enabling the housing bubble, independent of regulatory or housing-policy failures.
• Bailouts Were Necessary - contends that TARP and related interventions prevented a systemic collapse and that the cost was ultimately contained.
• Bailouts Were Unjust - argues that government rescues of financial institutions constituted a transfer of risk from reckless institutions to the public, with lasting moral hazard consequences.
• Dodd-Frank Was Adequate - holds that post-crisis regulatory reform sufficiently addressed systemic vulnerabilities.
• Dodd-Frank Was Insufficient - contends that reform left the fundamental structure of too-big-to-fail finance intact.
• Too Big to Fail Is Unresolved - argues that the largest financial institutions remain implicitly backstopped by government, perpetuating the conditions for future crises.

• Financial Crisis of 2008 - History
• Financial Crisis of 2008 - Debate
• Financial Crisis of 2008 - Economics Consensus
• Great Depression
• Dodd-Frank Act
• Federal Reserve
• Too Big to Fail
• U.S. Housing Bubble
• Mortgage-Backed Securities
• Troubled Asset Relief Program (TARP)
• Quantitative Easing
• 2008-2012 Global Recession

1. Financial Crisis Inquiry Commission. The Financial Crisis Inquiry Report. U.S. Government Printing Office, 2011. https://www.govinfo.gov/content/pkg/GPO-FCIC/pdf/GPO-FCIC.pdf
2. Bernanke, Ben S. The Courage to Act: A Memoir of a Crisis and Its Aftermath. W.W. Norton, 2015.
3. Paulson, Henry M. On the Brink: Inside the Race to Stop the Collapse of the Global Financial System. Business Plus, 2010.
4. Reinhart, Carmen M., and Kenneth S. Rogoff. This Time Is Different: Eight Centuries of Financial Folly. Princeton University Press, 2009.
5. Sorkin, Andrew Ross. Too Big to Fail: The Inside Story of How Wall Street and Washington Fought to Save the Financial System - and Themselves. Viking, 2009.
6. U.S. Bureau of Labor Statistics. “Labor Force Statistics from the Current Population Survey.” Unemployment rate data, 2008-2010.
7. Board of Governors of the Federal Reserve System. “Credit and Liquidity Programs and the Balance Sheet.” Federal Reserve, 2008-2009.
8. International Monetary Fund. World Economic Outlook: Crisis and Recovery. IMF, April 2009.