1. I have omitted academics who, on the whole, should also share the blame for seeing neither the crisis coming nor its depth when it did come.
⢠investors (ultimate lenders);
⢠mortgage borrowers;
⢠mortgage brokers (salesmen); and
⢠prudential bank regulators.
Some of their sins are catalogued and described below.
The Federal Reserve appears to have maintained short-term interest rates too low for too long in the early 2000s after the end of the 2001 recession.2 This is likely to have both helped to fuel the sharp rise in house prices nationwide and encouraged excessive corporate and household leverage, including by Hedge Funds and private equity firms. Moreover, the Fed appears to have not been sufficiently sensitive both to the adverse impact of a potential bursting of the banking system bubble and the macro-economy and to the full magnitude of the impact of equity extraction from residential mortgages when household borrowers refinanced at lower interest rates on current and future aggregate consumption and the riskiness of the loans.
The banks operated with far too little capital (excessive leverage) for their scale of operations and the risks they assumed. They increasingly based their basis for originating residential mortgage loans on expected continued increase in house prices rather than on the ability of the home buyer to meet monthly payments out of his/her current income. The banks engaged in poor and insufficient credit analysis of mortgage borrowers and outsourced much of the credit analysis of the complex securitised mortgage instruments that they purchased on the capital markets to credit rating firms. The banks introduced compensation schemes that relied heavily on loan production rather than on loan collection and on loan performance over too short a time period before defaults had a chance to occur. Such schemes encouraged excessive risk taking. The banks also tended to hold in their own portfolio only the senior, AAA-rated tranches of the complex mortgage-based securities, such as collateralised debt obligations (CDOs) that they packaged and sold (see below) rather than the junior, lower-rated tranches, which would have required more careful monitoring and would have shown earlier signs of trouble.
The banks created many of the CDOs outstanding, but did so through off-balance sheet entities, such as structured investment vehicles (SIVs), to reduce the banksā reported risk exposure. The banks sold streams of pooled cash flows from their whole long-term mortgages or mortgage-backed securities to the SIVs that financed them by borrowing short-term and transforming them into multi-tranched securities. The borrowing would be repaid when the CDOs were sold. However, as the name of the originating bank was associated with the CDO, there were implicit agreements that, to minimise their reputational risk, the banks would repurchase and thereby put back on their own balance sheets CDOs that encountered credit problems. In both their collection of data on the volume of CDOs and CDO-like securities and their monitoring of performance to measure the risk exposure of banks, the regulators failed to recognise the contingent liability of the banks and did not fully include the obligations of the SIVs. Thus, they greatly underestimated both the size of the CDO market and the risk exposure of the banks.
2. Taylor, Getting Off Track (Stanford: Hoover Press, 2009).
The credit rating agencies conducted incomplete credit analyses of the new complex mortgage securitised products, such as CDOs, particularly with respect to losses given default. In their testing, the agencies basically assumed no major nationwide bursting of the real estate price bubble, as no such serious price declines had occurred in recent memory. Thus, they failed to include extreme or tail values in their test simulations. Homes that were foreclosed and sold because of defaults were assumed to be sold at small if any losses and credit ratings on the new securities were assigned accordingly. Although the agencies were reasonably correct on their estimates of the probability of defaults, when the bubble burst, losses from defaults were substantially larger than had been anticipated and assumed in the ratings. The higher-rated tranches of the multi-tranched CDO securities, which received the first cash flows, from the underlying mortgages were downgraded, often by numerous ratings at a time, as the junior tranches, which received the last cash flows and cushioned the higher rated tranches, suddenly became worthless.
The agencies also failed to emphasise sufficiently to ratings users that the letter grade assigned was basically a relative grade within a class of securities and not a cross-security class. For example, an AAA CDO was not the same as an AAA corporate bond. Because the rating fee is paid by the issuer, the issuer may be able to influence the rating obtained by threatening to use another agency or none at all if the rating assigned by the agency was too low. As is shown later, the agencies were also pressured by some investors to upgrade their ratings so that some investors, who are restricted to higher rated securities by legislation or regulation, would have a greater range of eligible securities to choose from.
Banks hired financial engineers knowledgeable more for their quantitative skills than their financial skills both to quantify the risk exposures of the institution and to develop new securities. The complexity of the risk models developed was often beyond the ability of even senior financial executives to understand thoroughly so they did not fully appreciate their own risk exposures (black-box risk). Likewise, many of the securities innovations were highly opaque, highly complex, highly leveraged and, again, beyond the ability of many bankers and investors to understand. It has been estimated that a single mortgage CDO could pool as many as 750,000 individual whole mortgages with accompanying documentation running to some 30,000 pages.3 Lastly, the engineers apparently failed to recognise that information, particularly soft information, does not travel well down a chain of securities. Parts are lost or modified in the process. Thus, the quality of information varies more among individual investors in complex securities than for simpler securities and asymmetric information problems become more severe.
The US government actively promoted home ownership, in particular for low income and minority households. In the process, it encouraged and, at times, required mortgage lenders to provide loans to high-risk low-income and minority borrowers, often at below market rates of interest for that borrowerās risk class. Such lending was not sustainable on a profitable basis and led to the ultimate demise of both large quasi-government housing finance agencies ā Fannie Mae and Freddie Mac. These two agencies had been permitted by the government to operate at capital ratios considerably lower than those for commercial banks and with weaker regulatory supervision. The government also encouraged the use of low down-payment mortgage loans, often through government agencies, such as the Federal Housing Administration (FHA). These highly leveraged mortgages performed poorly and frequently defaulted when the borrower experienced financial difficulties.
Investors (buy side) are the ultimate lenders. Many failed to do proper credit evaluations and due diligence on the complex mortgage securities that they purchased. To do such work required more financial knowledge and training than many individual investors possessed. As noted earlier, mortgage CDOs often were based on a large number of individual mortgages with documentation running into tens of thousands of pages. Many investors outsourced the credit analysis to credit-rating agencies, which, again as noted earlier, failed to be as careful and accurate in their analyses as generally perceived. In addition, as many of these complex securities were new, opaque and little understood, they incurred innovation risk that accompanies almost ...