On March 8, 2003, Warren Buffett, the legendary investor and chairman of Berkshire Hathaway, issued a stark warning in his annual letter to shareholders. “Derivatives are financial weapons of mass destruction,” he wrote, “carrying dangers that, while now latent, are potentially lethal.” Few on Wall Street took him seriously. Derivatives had become the engines of a new financial order—complex, lucrative, and seemingly unshakable. At their peak in 2007, the global over-the-counter derivatives market had reached a staggering $596 trillion in notional value. Within that universe, one instrument had grown faster and more dangerously than any other: the credit default swap (CDS).
By the time the financial crisis erupted in 2008, the CDS market had become a house of cards propped up by layers of speculation, opacity, and leverage. At its center stood AIG Financial Products (AIGFP) , a London-based subsidiary of the world’s largest insurance company, which had sold $527 billion in credit default swap protection on subprime mortgage bonds by the end of 2007. AIGFP had collected billions in premiums while setting aside almost no capital to cover potential losses. When the housing market collapsed and the subprime mortgages underlying those bonds began to default, the credit default swap contracts triggered. AIG did not have the money to pay. The federal government stepped in with an $180 billion bailout, and the global financial system came within hours of complete collapse.
This article examines the rise of credit default swaps, their role in the financial crisis, and the regulatory failures that allowed them to proliferate. It explains how CDS work, why they became so popular, how they were used to bet on—and against—the housing market, and why the collapse of a single insurance company in London threatened to bring down the entire global financial system.
What Is a Credit Default Swap
At its most basic level, a credit default swap is a contract that functions like an insurance policy. The buyer of a CDS pays a periodic premium to the seller. In exchange, the seller agrees to compensate the buyer if a specified “credit event” occurs—typically a default, bankruptcy, or debt restructuring pertaining to a reference entity, such as a corporation, a sovereign government, or, in the case of the crisis, a pool of mortgage-backed securities.
The analogy to insurance is intuitive but imperfect. When you buy homeowner’s insurance, you must own the home. You cannot insure your neighbor’s house. But with credit default swaps, there is no such requirement. Investors could buy CDS protection on mortgage bonds they did not own, effectively betting that those bonds would fail. This is the difference between hedging (protecting an existing position) and speculation (betting on an outcome). The speculators had no exposure to offset; they were simply gambling on default.
How a CDS Worked in Practice
Imagine that a pension fund owned $10 million in bonds issued by a pool of subprime mortgages. The fund was worried that homeowners might default, causing the bonds to lose value. The fund could go to AIG’s London unit and purchase a CDS. The fund would pay AIG a quarterly premium—say, 1% of the notional amount per year, or $100,000 annually. In return, AIG promised that if the mortgage bonds defaulted, AIG would pay the fund the full $10 million, plus any missed interest.
To AIG, this seemed like free money. The housing market had never experienced a nationwide decline. Defaults on mortgage bonds were rare. The premiums collected were almost pure profit. AIG’s London unit, under the leadership of Joseph Cassano, sold billions of dollars in CDS protection on collateralized debt obligations (CDOs) exposed to subprime mortgages without setting aside capital reserves to cover potential losses. The relaxation of internal risk controls—following the ousting of longtime CEO Hank Greenberg in 2005—coincided with an explosion in AIGFP’s volume of CDS contracts.
But CDS are not insurance. They are unregulated over-the-counter derivatives, traded privately between counterparties without a central exchange, without transparent pricing, and without capital requirements. There was no requirement that the seller (AIG) maintain reserves to cover potential claims. There was no requirement that the buyer prove it owned the underlying bonds. And there was no central clearinghouse to track who owed what to whom. This regulatory vacuum, created by the Commodity Futures Modernization Act of 2000, was the legal foundation upon which the CDS market was built.
The Legal Loophole: The Commodity Futures Modernization Act of 2000
Before 2000, derivatives trading had been subject to a centuries-old legal tradition. The “rule against difference contracts”—rooted in English common law and codified in the Commodity Exchange Act of 1936—had treated derivative contracts that could not be proven to offset an existing position as unenforceable gambling contracts. Speculative wagers on prices could only be made safely on regulated exchanges, where trades were transparent, margin requirements were enforced, and counterparty risk was managed.
The Commodity Futures Modernization Act (CFMA) of 2000 overturned this framework. Lobbied for by financial industry heavyweights—including former Treasury Secretary Robert Rubin, Federal Reserve Chairman Alan Greenspan, and Senator Phil Gramm of Texas—the CFMA specifically exempted over-the-counter derivatives, including credit default swaps, from regulation by the Commodity Futures Trading Commission (CFTC). The act declared that OTC derivatives were not “futures” contracts subject to the Commodity Exchange Act. It carved out exemptions for “eligible contract participants”—a category that included virtually every bank, hedge fund, and insurance company—allowing them to trade derivatives freely without oversight.
The CFMA did not merely deregulate; it precluded regulation. The act contained language that explicitly prohibited the CFTC and the Securities and Exchange Commission (SEC) from regulating OTC derivatives for the two years following its passage. It also barred states from imposing their own capital or margin requirements on derivatives transactions. In effect, Congress had created a law-free zone where billions of dollars in financial contracts could be traded with no transparency, no capital reserves, and no counterparty oversight.
The consequences were dramatic. The CFMA, together with the repeal of Glass-Steagall a year earlier, had dismantled the regulatory architecture that had protected the financial system for decades. As one legal scholar put it: “The roots of the catastrophe lay not in changes in the markets, but changes in the law.” Over-the-counter derivatives had been treated as legally enforceable only when used for legitimate hedging purposes; after 2000, they became instruments for pure speculation, and the volume of CDS exploded.
By 2005, the CDS market had grown to over $20 trillion in notional value. By 2007, at its peak, the notional value of outstanding CDS had reached $62 trillion. The total number of CDS contracts had approached a staggering 180,000+ at their peak.
How CDS Became a Bet on the Housing Market
Synthetic CDOs: Betting Without Borrowing
The link between credit default swaps and the housing market was forged through synthetic collateralized debt obligations (synthetic CDOs) . Unlike traditional CDOs, which contained actual mortgage-backed securities, synthetic CDOs contained no mortgages at all. Instead, they were constructed entirely from credit default swap contracts that referenced the performance of mortgage bonds.
Here is how a synthetic CDO could be created: An investment bank would assemble a portfolio of credit default swaps on subprime mortgage bonds—meaning that the bank had either bought or sold protection on those bonds. It would then slice the premium stream into tranches, just as it would with a cash CDO, and sell those tranches to investors. The synthetic CDO allowed investors to place bets on subprime mortgages without ever owning a mortgage security, and without providing any capital to the housing market. It was pure speculation—a side bet on whether homeowners would pay their bills.
By 2007, the synthetic CDO market had become enormous. In April 2007, Goldman Sachs sold a $2 billion synthetic CDO called ABACUS 2007-AC1 to investors. The basket of reference assets was a set of credit default swaps on subprime mortgage bonds. What Goldman did not disclose to investors was that the hedge fund Paulson & Co. , which had helped select the reference portfolio, was simultaneously buying credit default swap protection on that same portfolio—betting that it would fail. When the subprime market collapsed, Paulson made billions of dollars, while investors in ABACUS lost nearly everything. Goldman Sachs later paid a $550 million fine to the SEC for failing to disclose Paulson’s role.
The ABACUS case was not an anomaly. By 2007, the entire synthetic CDO market had become a casino. Investment banks created CDOs filled with credit default swaps, many of which referenced the same underlying subprime mortgages. These instruments layered risk on top of risk, creating a daisy chain of counterparty exposures that no one could track. And at the center of this chain was AIG.
The AIG Story: How One Company’s Collapse Almost Broke the World
The Rise of AIG Financial Products (AIGFP)
American International Group (AIG) was the largest insurance company in the world, with over $1 trillion in assets and a triple-A credit rating. Its London-based subsidiary, AIG Financial Products (AIGFP), had begun selling credit default swaps in 1998, initially under tight supervision. AIGFP’s head reported directly to CEO Hank Greenberg, and every new transaction over a certain size had to pass a review by AIG’s chief credit officer.
But in 2005, Greenberg was forced out after 34 years as CEO as part of investigations into accounting irregularities. His successor, Martin Sullivan, dismantled the risk management architecture that Greenberg had built. The weekly portfolio risk meetings were abolished. The head of AIGFP was no longer required to report directly to the CEO. The unit, now under the leadership of Joseph Cassano, began selling credit default swaps at a furious pace, most of which involved CDOs exposed to subprime mortgages.
The Super Senior CDS Product
The particular product that proved disastrous was the “super senior” credit default swap. AIGFP sold protection on the senior-most tranche of CDOs—the tranche that was supposed to be the safest. The premiums collected on these swaps were high, because AIGFP was a triple-A-rated counterparty. The profit margins on these contracts were enormous: they rose from 44% in 2002 to 83% in 2005.
By the end of 2005, AIGFP’s exposure to CDOs was $17 billion. By the end of 2007, it had reached $54 billion—and the notional value of the derivative contracts it had sold had grown to over $500 billion. One AIG executive later testified that AIGFP believed “they would continue to perform satisfactorily” because the swaps covered mortgages provided when lending practices were “more conservative.” “As it turned out, we were wrong about how bad things could get.”
The Collapse of the House of Cards
By late 2007, the subprime mortgage market was in free fall. Homeowners were defaulting. The mortgage-backed securities that AIG had insured were deteriorating in value. The credit default swap contracts that AIG had sold included a critical feature: collateral posting requirements. If AIG’s credit rating were downgraded, or if the underlying securities lost value, AIG would be required to post additional collateral to its counterparties as security against its obligations.
In March 2008, the rating agencies downgraded AIG. The collateral calls began. AIG’s counterparties—Goldman Sachs, Société Générale, Merrill Lynch, and others—demanded that AIG post billions of dollars in collateral immediately. AIG did not have the cash. The company’s liquidity “declined precipitously as credit markets froze,” and AIGFP could not make good on all the collateral call demands.
On September 15, 2008—the same day Lehman Brothers filed for bankruptcy—the rating agencies downgraded AIG again. The collateral calls multiplied. By the end of the day, AIG estimated that it would need $85 billion in the next 48 hours to meet its obligations. It did not have $85 billion. It had nothing.
The Federal Reserve and the Treasury Department faced an impossible choice. If AIG failed, every major bank in the world that had bought CDS protection from AIG would be exposed to massive, immediate losses. The entire derivatives market—$62 trillion in notional value—would seize up. Counterparty risk would cascade through the system. The global financial system would collapse.
The Fed agreed to bail out AIG. Over the following months, the total aid package reached more than $180 billion. The government took a nearly 80% ownership stake in the company. Joseph Cassano, who had left AIGFP in early 2008 but remained as an adviser, defended the unit’s decisions, later telling the Financial Crisis Inquiry Commission that the underlying CDOs were “money good” and that he could have negotiated a better deal. He testified that he “would have expected there would have been few, if any, realized losses on the (credit-default swap) contracts had they not been unwound in the bailout.” The commissioners were not persuaded.
Contagion: How Counterparty Risk Froze the System
The collapse of AIG exposed the fundamental vulnerability of the CDS market: counterparty risk. When one party to a CDS contract cannot pay, the other party faces immediate losses. Those losses can trigger additional failures, creating a chain reaction of defaults.
In normal financial markets, counterparty risk is managed through central clearinghouses—entities that stand between buyers and sellers, guaranteeing performance and requiring both parties to post collateral. The futures market, for example, uses a central clearinghouse. But credit default swaps were traded over the counter, bilaterally, between private counterparties. No one tracked the total exposure. No one knew who owed what to whom.
When AIG faced collapse, its counterparties faced immediate losses. Goldman Sachs, which had purchased billions in CDS protection from AIG, was exposed. Société Générale was exposed. Merrill Lynch and Bank of America were exposed. The entire web of CDS contracts—estimated at $62 trillion in notional value—was suddenly suspect. If AIG could not pay, perhaps other CDS sellers could not pay either. The market froze.
This is what the former Federal Reserve Chairman Ben Bernanke later called “the worst financial crisis in global history, including the Great Depression.” The freeze in the CDS market triggered a freeze in the commercial paper market, which triggered a freeze in the repo market, which triggered a freeze in interbank lending. Within days, the global financial system had stopped functioning.
The bailout of AIG was not a gift to a failing company; it was a necessary intervention to prevent the entire derivatives market from unraveling. The government had no choice. As one Treasury official put it, “If AIG goes, the global financial system goes with it.”
The Aftermath: Regulation and Reform
The crisis exposed the catastrophic consequences of unregulated derivatives trading. In response, the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 included several major reforms to the CDS market:
· Central clearing: Many OTC derivatives, including credit default swaps, were required to be cleared through central counterparties (CCPs), which would stand between buyers and sellers, collect collateral, and manage counterparty risk.
· Exchange trading: Standardized derivatives were required to be traded on exchanges or swap execution facilities (SEFs), bringing transparency to pricing.
· Margin and capital requirements: Banks and other derivatives dealers were required to post initial and variation margin on their derivative positions.
· Position limits: The CFTC was granted authority to set position limits on certain derivatives to prevent excessive speculation.
· End-user exemptions: Commercial end-users—such as airlines hedging fuel costs—were exempted from certain requirements, preserving the ability to hedge genuine risks.
The notional value of outstanding CDS has fallen dramatically. From its 2007 peak of $62 trillion, the market had halved to just over $30 trillion in 2009, and by 2020 it had declined to approximately $8–9 trillion. However, critics note that much of this decline is due to “portfolio compression”—netting long and short positions against one another—rather than a reduction in actual risk-taking.
The Unlearned Lessons
Despite the reforms, the underlying vulnerabilities of the CDS market have not been fully eliminated. The over-the-counter derivatives market is still large—the Bank for International Settlements reported that the global OTC derivatives market had a notional value of over $600 trillion in 2024, surpassing its pre-crisis peak. Credit default swaps on sovereign debt remain controversial, with some arguing that they enable speculative attacks on countries.
Moreover, the central clearinghouses that now stand at the center of the derivatives market have created a new form of systemic risk. “Too big to fail” has been replaced by “too connected to fail.” If a major clearinghouse were to fail, the consequences would be even more catastrophic than the collapse of a single bank.
The question of whether derivatives should be regulated as insurance—with capital reserves, consumer protections, and oversight—or as gambling contracts remains unresolved. The CFMA’s deregulatory framework was repealed by Dodd-Frank, but subsequent legislation has rolled back some of those provisions. The Trump administration and Republican-controlled Congress passed the Financial CHOICE Act in 2017, which eased derivatives regulations for smaller banks. The debate over derivatives regulation is far from settled.
Conclusion
Credit default swaps were supposed to be tools for managing risk. Instead, they became instruments of pure speculation, enabled by a deregulatory legal regime that treated gambling on default as a legitimate financial activity. When the housing market collapsed, the $62 trillion CDS market triggered a chain reaction of counterparty failures that nearly brought down the global financial system. The collapse of AIG, the world’s largest insurance company, was not a failure of its insurance business but of its unregulated derivatives business—a business that Congress had explicitly exempted from oversight in 2000.
The reforms enacted after the crisis have made the derivatives market safer, but the underlying risks have not vanished. The same financial innovation that created CDS continues to evolve. The same regulatory arbitrage that drove derivatives into the shadows continues to push risk into less regulated corners of the financial system. Warren Buffett’s warning that derivatives are “financial weapons of mass destruction” was prescient. But the weapons have not been dismantled. They have merely been moved to different hands.
Further Reading & Sources
· Lewis, Michael. The Big Short: Inside the Doomsday Machine. W.W. Norton, 2010.
· McLean, Bethany, and Joe Nocera. All the Devils Are Here: The Hidden History of the Financial Crisis. Portfolio, 2010.
· Sorkin, Andrew Ross. Too Big to Fail: The Inside Story of How Wall Street and Washington Fought to Save the Financial System—and Themselves. Viking, 2009.
· Stout, Lynn A. “How Deregulating Derivatives Led to Disaster, and Why Re-Regulating Them Can Prevent Another.” Lombard Street, vol. 1, no. 7 (July 2009).
· Tett, Gillian. Fool’s Gold: How the Bold Dream of a Small Tribe at J.P. Morgan Was Corrupted by Wall Street Greed and Unleashed a Catastrophe. Free Press, 2009.
· Financial Crisis Inquiry Commission. The Financial Crisis Inquiry Report. Public Affairs, 2011.
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