From Collapse to Comeback: How a New Era of Investing Was Triggered by the 2008 MBS Catastrophe

There is no doubt that the 2008 financial crisis was one of the most catastrophic events in contemporary economic history, and at the centre of the catastrophe were mortgage-backed securities (MBS). Once thought to be secure, stable, and revenue-producing investments, they quickly turned into rubble, destroying confidence in the global financial system. However, in a surprising turn of events, this collapse ushered in a new era of investing by opening the door to a more robust and well-regulated MBS market. The seasoned investor, after all, is not one who only relishes the market’s highs; they are shaped in its worst downturns and learn not to panic amid the chaos, but to recognize opportunity.

In the 70s and 80s, U.S. government-sponsored entities created the first MBS. These mortgages were pooled and “pass-throughs” were then sold to investors, who received shares of homeowners’ principal and interest payments. At the start, these MBS were deemed safe due to agency backing, which was very often guaranteed by the U.S. government.

Yet in the 90s, Wall Street investment banks expanded this market with non-agency MBS, called “private-label” MBS, which were not guaranteed by the government. Instead, banks ended up splitting mortgage pools into tranches, which were layers of risk and reward.

The true crisis began during the 2000s, when highly rated (AAA) tranches were being filled with much riskier (BB) loans — or even worse, with so-called NINJA loans: No Income, No Job, No Assets. This was allowed through complex financial engineering as well as dubious rating-agency practices. Banks took tranches with BBB or BB ratings from different MBS pools and then repackaged them into a new product, before tranching the CDOs (Collateralized Debt Obligations) again. This meant that some slices of these unstable bonds were labeled AAA since they resided at the top of the new structure. The calculations behind it made it look like CDO tranches carried negligible risk, thus gaining those AAA ratings. There was also a massive conflict of interest because agencies earned fees from the banks creating these securities, which led them to prioritise quantity over quality. This in turn contributed to the creation of synthetic CDOs — essentially bets on bets of mortgage performance after real mortgages ran out — massively multiplying the losses when defaults surged.

However, the housing market tanked across the nation, and these newly repackaged AAA tranches were hit. By 2007, about 75% of CDO tranches were rated AAA, despite the fact that their underlying mortgages were usually subprime. Thus, BB and BBB risk was laundered into AAA bonds through repeated packaging.

Ultimately, when housing prices fell, a lot of borrowers stopped paying their mortgages. Losses worked their way up the tranche structure, wiping out the BBB and BB tranches and eventually even many AAA tranches. Investors — primarily pension funds, banks, and insurers — who believed they held near risk-free assets suddenly faced massive losses. This chain reaction was one of the key triggers of the Global Financial Crisis — so catastrophic, in fact, that at one point the global financial system was just 24 hours away from collapse, according to former Fed officials.

In the aftermath, the Dodd-Frank Act of 2010 required banks to keep more capital on hand and forced MBS and CDO issuers to retain at least 5% of the credit risk so they could not simply pass all the risk to investors. The Act also created the Consumer Financial Protection Bureau (CFPB) to protect borrowers from predatory and dubious lending. Rating agencies faced backlash and were placed under stricter oversight, while new “stress tests” were introduced to determine whether banks could survive economic shocks, including requirements for higher liquidity reserves.

In addition to these reforms, stricter rules on mortgage lending were also implemented to avoid another risky subprime boom and to focus more on borrowers’ actual ability to repay. Agency MBS maintained their dominance, but private-label MBS shrank significantly. The long-term impact included many banks collapsing or merging, trillions of dollars in losses across the globe, and massive government bailouts. Iceland, of all places, was hit especially hard. The small country’s banking sector had ballooned to ten times the size of its GDP due to exposure to toxic mortgage-backed assets. When the bubble burst, all three of its major banks collapsed.

Following these developments, the question of whether MBS are still desirable investments in the current environment emerges in light of these changes. In short: possibly, but only after careful consideration. Focusing on government-backed issues is the safer course of action, especially in a situation when interest rates could change again.

All things considered, the 2008 MBS crisis still serves both as a warning and as a spur for improvement. As a result of the market’s collapse, today’s MBS are safer and more transparent than they have been in decades. The history of MBS is no longer one of collapse but of recovery — for investors who are prepared to learn from the past.