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2008 global financial crisis
2007–2009 (Lehman Brothers failed September 15, 2008)· Event· Global
Well documentedSolid records, physical evidence or scientific consensus.
A worldwide financial collapse in 2007–2009, triggered by bad US mortgage loans, that caused the deepest recession since the 1930s.
See it on the History map →What happened
Through the 2000s, lenders made risky 'subprime' home loans, which banks bundled into complex securities, rated safe and sold worldwide. When US house prices fell from 2006, defaults spread and those securities lost value. Investment bank Lehman Brothers failed on September 15, 2008, and credit froze. Governments rescued banks, the Federal Reserve cut rates to near zero, and Congress passed a $700 billion bailout (TARP). US unemployment hit 10% in 2009.
Why it matters
It wiped out trillions in wealth and millions of homes through foreclosure, brought tougher bank rules, and began a decade of near-zero interest rates that lifted asset prices.
Think of it like
Mortgage securities were sliced like a capital stack, with lower tranches taking losses first. When defaults spread widely, even the 'safe' senior tranches took hits.
How we know
The Financial Crisis Inquiry Commission report (2011), bank and court records, Federal Reserve data, and books such as Michael Lewis's The Big Short.
Still debated
Economists still debate the main cause (reckless lenders, rating agencies, housing policy or cheap global money) and whether letting Lehman fail was a mistake.
Connections (2)
▸2008 global financial crisis was the worst crash since the Great DepressionWell documented
The connection
Measured by lost output, bank failures and global reach, 2008 was the worst crisis since the 1930s, hence the name 'Great Recession'. Policymakers used the Depression's lessons on purpose: Fed chair Ben Bernanke, a Depression scholar, flooded markets with money, and governments spent heavily to avoid repeating 1930s mistakes.
When and how
2007–2009, centered in the US and Europe. US output fell about 4%, against about 26% in 1929–33.
How we know
Economic data rank 2008 as the deepest downturn since the 1930s; Bernanke's research and memoir describe applying Depression lessons.
Debates and open questions
Whether the forceful response prevented a second Depression, or fed later problems like asset bubbles and inequality, is debated.
▸Globalization turned a US crash into the 2008 global financial crisisMostly agreed
The connection
Banks worldwide had bought US mortgage securities and lent to each other across borders. When those securities soured, losses hit European banks, Iceland's banking system collapsed, and world trade volume fell about 12% in 2009. A US housing bust became a world recession.
When and how
2007–2009: failures and rescues from Iceland and Ireland to Britain's Northern Rock and RBS and Germany's banks.
How sure are we?
Bank losses, bailout records and trade data trace the spread; the Bank for International Settlements documents banks' cross-border exposures.
Debates and open questions
Economists debate whether global money flows, such as Asian savings pouring into US bonds, helped cause the bubble or mainly spread the damage.