The Big Short

The financial system loves selling the illusion that anyone can get rich quick by borrowing money. In the United States during the 2000s, that promise exploded in residential mortgage lending with no verification of income, employment, or prior assets. It was the triumph of the subprime loan, a high-risk product granted on a massive scale to borrowers with extremely fragile credit histories.

In everyday terms, it is like financing a luxury imported car with zero down payment and no steady paycheck, simply because the first few monthly installments fit your current budget. The hidden trap was that the contract featured short-term teaser rates, followed by brutal contractual resets that made the monthly payments unaffordable after two years.

The market ignored the danger, betting that home prices would rise forever. If the monthly payment became too heavy, a homeowner could simply sell the house for a profit in a hot market or refinance the debt based on recent appreciation. That euphoria, detached from the real income of working families, fueled a gigantic pyramid of mortgage contracts.

While Wall Street executives celebrated billion-dollar annual bonuses, a money manager in California decided to investigate what lay behind the official narrative. Michael Burry, founder of Scion Capital, was a former physician with a glass eye and traits of autism who preferred analyzing balance sheets to attending dinners and social conventions.

Burry did the painstaking work that the rest of the market neglected: he downloaded hundreds of bond-issuance reports and read every technical prospectus for the mortgage-backed securities. He noticed that credit quality had plummeted between 2004 and 2006, with loans granted to borrowers who did not even have steady incomes. He calculated that delinquency would explode as soon as the teaser rates expired, starting in 2007.

The manager's conclusion was terrifying: the heart of the American banking system was rotten from the inside. Nobody noticed the abyss because immediate fees and commissions were generating fortunes for middlemen in the present. To Burry, the collapse was not a remote possibility, but a mathematical certainty with a scheduled date on the payment calendar.

Predicting the collapse was only half the challenge; profiting from that realization required finding the right trading instrument. There was no simple, liquid way to bet against residential mortgage portfolios. Burry therefore decided to use a derivative contract rarely used for that specific purpose: the Credit Default Swap, widely known as a CDS.

In practice, a CDS worked like an accident insurance policy. The buyer paid modest regular premiums in exchange for a multimillion-dollar payout if the insured bond suffered a default. Burry approached giant banks like Goldman Sachs and Deutsche Bank, offering to pay annual premiums to insure subprime bonds. To the banks, selling insurance on housing looked like free money, generating immediate profitability for their trading desks.

The trade was a perfect asymmetric bet with limited risk and massive upside. If he were wrong, Burry would lose only the small contractual fees accumulated over the months. If he were right, he would collect astronomical sums. The market sold billions in protection, convinced it was pocketing easy premiums from a paranoid investor.