The concept of "too big to fail" emerged in American banking during the 1980s, when regulators rescued Continental Illinois, then the seventh-largest bank in the country, rather than let it collapse and risk wider panic. That intervention established a precedent. By the 1990s and 2000s, consolidation had produced financial institutions far larger than Continental Illinois, with balance sheets measured in the hundreds of billions of dollars and networks of counterparty relationships that touched every corner of the global financial system. Economics textbooks and civics classes taught students that these institutions occupied a special category. If Citigroup or Bank of America or Goldman Sachs faced insolvency, the government would intervene, because the alternative, a disorderly failure that spread contagion through money markets and payment systems, was unthinkable.
This was presented not as a policy promise but as a fact about how modern finance worked. The implicit guarantee was never codified in statute, never voted on by Congress, but it was understood by bond markets and credit rating agencies. Large institutions borrowed at lower rates than smaller competitors because creditors assumed the government backstop reduced default risk. The moral hazard was obvious to economists who studied it, institutions that expect to be rescued have weaker incentives to manage risk prudently, but the guarantee seemed unavoidable. When Bear Stearns teetered in March 2008, the Federal Reserve arranged a hasty sale to JPMorgan Chase and backstopped $29 billion in questionable assets. The message to markets was clear: no major institution would be allowed to fail.
Six months later, Lehman Brothers faced a similar crisis. Its portfolio of mortgage-backed securities had collapsed in value, its stock price had fallen 94 percent in a year, and it was bleeding cash. On the weekend of September 13, 2008, Treasury Secretary Henry Paulson and Federal Reserve Chairman Ben Bernanke convened Wall Street executives to arrange a private-sector rescue. When that effort failed, they made a decision that shocked the financial world. They would not use public money to save Lehman. On Monday, September 15, Lehman filed for bankruptcy, the largest in American history, with $639 billion in assets.
The consequences were immediate and catastrophic. The Reserve Primary Fund, a money market fund holding $785 million in Lehman commercial paper, saw the value of that paper drop to zero. Its net asset value fell below one dollar per share, an event called "breaking the buck" that had happened only once before in the history of money market funds. Investors fled. Within days, $200 billion had been withdrawn from money market funds across the industry. The commercial paper market, which corporations rely on to finance payroll and inventory, froze. Credit markets around the world seized. The assumptions that had governed finance for two decades, that the government would not allow a systemically important institution to fail, proved wrong.
Then, within days, the government reversed course. On September 16, the Federal Reserve extended an $85 billion emergency loan to AIG, the insurance giant whose collapse would have triggered the liquidation of billions in derivatives contracts. In October, Congress passed the Emergency Economic Stabilization Act, authorizing $700 billion for the Troubled Asset Relief Program. Citigroup received $45 billion in capital injections. Bank of America received $45 billion. The institutions that regulators deemed truly too big to fail were rescued. Lehman, which officials had judged could be allowed to fail without systemic consequences, could not. Both judgments were wrong.
What students had been taught was simultaneously disproven and confirmed. Some institutions were allowed to fail. Other institutions were too big to fail. There was no coherent rule separating the two categories, only a series of panicked decisions made over a catastrophic two-week period. The policy incoherence revealed something economics classes had not emphasized: the implicit guarantee was not a careful calculation of systemic risk but a political gamble, one the government lost when it guessed wrong about Lehman.
