The Night Wall Street Broke the World

For years before 2008, American banks had been bundling risky home loans — many handed out to borrowers who realistically couldn't afford them — into complex securities and selling them on as if they were safe. When enough of those borrowers stopped paying, the securities turned out to be worth far less than anyone had priced them at, and the banks holding them were far more exposed, and far more leveraged, than the market understood.

Lehman Brothers was one of those banks. In the early hours of September 15, 2008, after a weekend of failed rescue talks, it filed for the largest bankruptcy in U.S. history. What happened next wasn't really about Lehman anymore — it was about trust. Banks lend to each other constantly, overnight, on the assumption that the other side is solvent. After Lehman, nobody was willing to make that assumption about anybody. Short-term lending between banks effectively seized up within days.

This is where the story stops being an American one. Modern banking is globalized: pension funds, mutual funds, and hedge funds in Tokyo, Seoul, and Mumbai all held assets tied, directly or indirectly, to the same frozen credit markets. As losses mounted, many of these funds faced redemption requests — investors wanting their money back — and had to sell whatever they could, wherever they could, to raise cash quickly. Forced selling doesn't wait for a good price.

Japan's Nikkei 225 fell more than 11% in the days immediately following the Lehman collapse, one of its sharpest drops in decades, as investors around the world rushed toward the safety of cash and government bonds. South Korea's KOSPI, in a market especially dependent on foreign capital, saw both a steep equity sell-off and a sharp fall in the won as dollars were pulled out of emerging Asia.

India was not spared either. Foreign Institutional Investors, who had poured money into Indian equities through the boom years leading up to 2008, reversed course — selling Indian shares to raise cash for problems back home. The Sensex, already under pressure through 2008, fell further in the following weeks, and the rupee weakened noticeably against the dollar as capital left.

Economists call this pattern 'financial contagion' — deliberately borrowing the language of disease. Like a virus, it doesn't need a direct cause to spread; it just needs connections, and by 2008 the world's markets were more connected than they had ever been.

The regulatory scaffolding that followed — tighter bank capital requirements under Basel III, closer scrutiny of systemic risk by bodies like India's SEBI and RBI, larger foreign exchange reserve buffers held specifically to weather sudden capital flight — exists largely because of what that one September week made painfully clear: a bank collapsing in Lower Manhattan can move a market eight time zones away before the week is out.