The 2008 financial crisis was not a singular event but the culmination of several interconnected factors, primarily rooted in the U.S. housing market. Excessive speculation on property values, coupled with a significant decline in lending standards, created a housing bubble that eventually burst. This article explores the critical elements that contributed to the crisis, including weak underwriting practices, predatory lending, and the complex role
of financial innovation.
Deterioration of Underwriting Standards and Predatory Lending
A key contributor to the crisis was the dramatic decline in subprime lending standards. In the early 2000s, a subprime borrower typically had a FICO score of 660 or less. By 2005, many lenders lowered the required FICO score to 620, making it easier for riskier borrowers to qualify for loans. The emphasis on proof of income and assets diminished, moving from full documentation to low documentation, and eventually to "no documentation" loans. The "no income, no job, no asset verification required" (NINJA) mortgage became prevalent, informally known as "liar loans" because they encouraged borrowers to misrepresent their financial status.
Testimony to the Financial Crisis Inquiry Commission revealed the extent of this problem. By 2006, 60% of mortgages purchased by Citigroup from its 1,600 mortgage companies were "defective," meaning they did not meet underwriting policies or lacked required documents. This figure rose to over 80% in 2007. Similarly, an analysis by Clayton Holdings of over 900,000 mortgages from January 2006 to June 2007 found that scarcely 54% met their originators' underwriting standards, and 28% did not meet even minimal issuer standards. Alarmingly, 39% of these substandard loans were subsequently securitized and sold to investors.
Predatory lending further exacerbated the situation, involving unscrupulous lenders enticing borrowers into unfair or abusive secured loans. Countrywide Financial, for example, was sued for using "deceptive tactics to push homeowners into complicated, risky, and expensive loans" to sell them to third-party investors. A former Countrywide employee admitted, "If you had a pulse, we gave you a loan." Employees from Ameriquest, a leading wholesale lender, described being pressured to falsify mortgage documents to sell to Wall Street banks, suggesting mortgage fraud was a significant cause of the crisis.
The Role of Financial Innovation and Mispriced Risk
Financial innovation, intended to manage risk and facilitate financing, also played a critical role. Products like adjustable-rate mortgages, the bundling of subprime mortgages into mortgage-backed securities (MBS) and collateralized debt obligations (CDOs), and credit default swaps (CDS) expanded dramatically. CDO issuance surged from $20 billion in Q1 2004 to over $180 billion by Q1 2007, with the credit quality declining as subprime debt increased from 5% to 36% of CDO assets. The complexity of these products made them difficult to value, and the distance from the underlying assets led actors to rely on indirect information and flawed computer models.
Mortgage risks were widely underestimated, with institutions failing to account for the possibility of falling housing prices. The limitations of default and prepayment models led to the overvaluation of mortgage and asset-backed products. While derivatives were meant to spread risk, the underestimation of falling housing prices led to aggregate risk. A widely used financial model, the Gaussian copula formula, which assumed a correlation between CDS prices and mortgage-backed securities, proved flawed. This model's breakdown in 2008 contributed to trillions of dollars in losses, highlighting a "shocking abdication of responsibility" by rating agencies and banks who relied on these complex, often opaque, financial instruments.
