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The Global Financial Crisis

In 2007 the British queued outside banks for the first time in 141 years. The machine that failed was one almost nobody, including the people running it, actually understood.

In plain English

Banks have one ancient weakness. They borrow money that can be demanded back at any moment, and they lend it out for decades at a time. The whole trick works only as long as everyone stays calm, because no bank on Earth can give everyone their money back on the same day.

In the 2000s, banks added a modern twist. Loans, mostly American mortgages, were chopped up, bundled, and sold on as securities: paper promising the income from thousands of mortgages at once. The paper was stamped as ultra-safe, traded worldwide, and used as collateral for yet more borrowing. By 2007 the world's banks were lashed together by trillions of pounds of it, and almost nobody could say what any given bundle actually contained.

Then American house prices fell, and the question "what is this paper worth?" had no answer. Banks stopped lending to each other, because nobody could tell who was holding the losses. Money markets, the plumbing that every bank draws on daily, froze. And institutions that had borrowed short and lent long, which is to say all of them, started to suffocate.

Five things to file under "wait, what?"

  • Britain queued for its money for the first time since 1866. In September 2007, savers formed lines outside Northern Rock, the first run on a British bank in 141 years. Around a billion pounds left in a single day. The bank had funded its mortgages from short-term money markets rather than deposits, and when those markets froze it was finished in a week. It was nationalised the following February.

  • The biggest bankruptcy in history took a weekend. Lehman Brothers, a 158-year-old investment bank, filed for bankruptcy on Monday 15 September 2008 with over six hundred billion dollars of debts, after a weekend in which nobody could be persuaded to buy it. The assumption that no government would let a bank that size fail died that morning, and global lending seized within hours.

  • The Queen asked the question everyone was avoiding. Visiting the London School of Economics in November 2008, Elizabeth II asked why nobody had seen it coming. It took the British Academy eight months to reply, in a letter concluding it had been "a failure of the collective imagination of many bright people". Many had seen pieces of the problem. Almost nobody had put the pieces together.

  • A Scottish bank was briefly the biggest in the world, then a ward of the state. Royal Bank of Scotland's balance sheet had grown larger than the entire British economy. Saving it took £45.5 billion of public money, the largest bailout in British history, and the state did not sell its final share until 2025, seventeen years later, at a heavy overall loss.

  • The emergency measures lasted a generation. The Bank of England cut interest rates to 0.5% in March 2009, the lowest in its three-century history to that point, and they stayed near zero for over a decade. It also created £895 billion of new money to buy bonds, a policy called quantitative easing that was meant to be temporary and defined an era instead.

The full story

The machine that broke

Start with an ordinary mortgage. A bank lends against a house and collects repayments for 25 years. Old-fashioned banking held that loan, and that risk, to maturity.

Securitisation changed the shape of the business. Thousands of mortgages were pooled and the pool's income sold to investors as bonds. Those bonds were then repackaged into further bonds, collateralised debt obligations, sliced into layers of supposed safety. Rating agencies, paid by the very firms issuing the paper, stamped the upper layers AAA: as safe, on paper, as a government. Pension funds and banks across the world bought them precisely because of that stamp.

The alchemy in the middle was the belief that American house prices would not fall everywhere at once, because they never had. Once they did, the safety of every layer became unknowable. Not zero: unknowable, which for the plumbing of finance is worse. Collateral that cannot be valued cannot be borrowed against, and the world's banks were borrowing against it nightly.

Why it reached your high street

Northern Rock held almost none of the exotic American paper. It failed anyway, because it shared the underlying disease: dependence on short-term wholesale borrowing that could vanish overnight. That is the lesson the crisis taught most clearly. The danger was never one bad product. It was maturity mismatch at scale, promises to repay instantly funded by assets that pay back over decades, spread through a system too interconnected for any one failure to stay contained.

So a fall in house prices in Nevada and Florida became, within eighteen months, the near-collapse of banks in Edinburgh and Newcastle, a British recession that erased six percent of the economy, and a decade of public spending cuts justified by the cost of the rescue.

Why nobody stopped it

The honest answer given to the Queen holds up. Regulators watched individual banks rather than the connections between them. Risk models measured the recent, benign past and extrapolated it. Ratings blessed the paper. Bonuses rewarded volume this year, not solvency in ten. Each participant behaved almost rationally inside their own square of the board, and the board as a whole tilted until everything slid off. Economists call it systemic risk. The British Academy's phrase is better: a failure of collective imagination.

What changed, and what it has to do with you

Banks are now required to hold several times more capital than in 2007. British retail banking is ring-fenced from investment banking. And the part that matters practically: deposits are protected up to £85,000 per person, per banking licence, by the Financial Services Compensation Scheme. That number exists because of those queues in 2007, and checking your savings sit within it is the single most useful thing this story can prompt you to do.

The deeper lesson is older than any regulation. Money you cannot explain is risk you cannot see, whether it is a collateralised debt obligation or an investment product a friend swears by. If nobody can tell you plainly where the return comes from, the return is coming from somewhere you would not like.

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