The 2008 financial crisis: causes, timeline and lessons

What was the 2008 financial crisis, and where did it start?

The 2008 financial crisis was a run on the global financial system that grew from losses on US home loans. Mortgage securities held by banks in the United States and Europe lost value together, and lenders stopped trusting one another. The Federal Reserve History essay on the Great Recession dates the recession from December 2007 to June 2009, a span of 18 months.

The crisis started in housing and spread through debt contracts that tied banks to each other. A home loan in one US town could sit inside a security held by a bank on another continent. That wiring explains why a local price fall became a worldwide event, and why each guide in this series follows the chain link by link.

Which causes of the 2008 financial crisis mattered most?

5 causes combined: a housing boom, weak mortgages, securities that hid risk, ratings that signalled safety, and rules that allowed heavy borrowing. The guide to 2008 financial crisis causes ranks them and shows how each fed the next. Removing any single link would have shrunk the crisis, so the sequence matters more than any one villain.

Interest rates played a part as well. The federal funds target fell from 6.5% to 1.0% between 2000 and June 2003, and economists still debate how much that fuelled housing. John Taylor argued in 2007 that low rates helped expand housing activity, while Ben Bernanke argued in 2010 that such factors explain only a small portion of the boom.

How did the 2008 financial crisis unfold month by month?

Warnings came early. New Century Financial, a leading subprime lender, filed for bankruptcy in April 2007, and large numbers of mortgage securities were downgraded soon after. Pressure reached short-term funding markets in August 2007. The financial crisis timeline places each date in order and shows how slowly the official response caught up with events.

Spring 2008 brought the rescue of Bear Stearns by JPMorgan Chase with Fed assistance. September 2008 brought the Lehman Brothers bankruptcy, followed the next day by Fed support for AIG. The back-test records the Lehman filing on 15 September 2008 with $619 billion of debt (EQOS Asia 2008 back-test, 2026).

How far did the 2008 stock market crash take share prices down?

Share prices followed the banking stress down. By early 2009, US stocks had fallen about 50% and housing prices nearly 30% on average, according to the Wikipedia survey of the subprime crisis. The guide on the 2008 stock market crash follows how the S&P 500 and the Dow moved through that period.

The stock market fall mattered because it hit pensions and savings while jobs were also at risk. The same drop that shrank retirement accounts made banks more cautious about lending, so the market fall and the credit squeeze fed each other and widened the damage.

What did the Great Recession cost households after the 2008 financial crisis?

The Great Recession followed the crash. The Fed reports that the unemployment rate more than doubled from under 5% to 10%, and real GDP fell 4.3% from peak to trough. The Great Recession guide covers jobs, homes and growth, in the order each channel hurt.

Homes carried the longest damage. Average US prices fell by over a fifth nationally from the first quarter of 2007 to the second quarter of 2011. The EQOS Asia study counts 10 million foreclosures, 8 million jobs lost and about $22 trillion of value destroyed, an IMF estimate it cites (EQOS Asia 2008 back-test, 2026).

Which banks became too big to fail in the 2008 financial crisis?

Several large firms became too big to fail: their collapse threatened the whole system, so governments stepped in. The US Treasury proposed a $700 billion rescue on 18 September 2008, and Congress passed the Emergency Economic Stabilization Act, which created TARP, on 3 October 2008.

Leverage explains the fragility. The study shows banks running at about 30:1, so a fall of 3.3% in asset values was enough to wipe out the capital of a bank such as Lehman Brothers (EQOS Asia 2008 back-test, 2026). Capital rules changed afterwards, and the guide traces which ones.

Who saw the 2008 crash coming, and what did The Big Short show?

A few investors bet against the housing market before the crash. The Big Short tells the story of those investors, and the guide on who saw the crash coming separates what is documented from what a retelling dramatises.

Warnings also came from data anyone could read. The study notes a price-to-income ratio of 4.6× against an average of 3.2×, and a subprime default rate of 14.4% at the end of 2006 (EQOS Asia 2008 back-test, 2026). Public figures flagged stress well before the failures began.

Could the 2008 financial crisis happen again, and what would a model show?

The lessons of 2008 form a checklist. Nobody can promise that history repeats, yet the ingredients are well known: cheap credit, weak lending standards, opaque securities and high leverage. The guide asks whether the 2008 financial crisis could happen again by checking each ingredient against today’s rules, as of October 2026.

A model can also test the past. The study computes φ(S) = 0.234 for the system in 2006 and 2007, below the 0.3 critical threshold, with 6 of 9 dimensions critical. Whether it would have predicted the 2008 crash is the question of the back-test guide. You can test your own case on the Λ simulator.

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About the author

Stéphane Jambu

President, EQOS Forecast Asia

Stéphane Jambu leads EQOS Forecast Asia and works as a consultant in e-commerce, search visibility, and AI. LinkedIn profile