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Market Watch What Caused the Housing Bust
Market Watch What Caused the Housing Bust 
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| What Caused the Housing Bust |
| Monday, 24 December 2007 | |||
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Page 1 of 3 For nearly 10 years, as interest rates fell from 1995 to 2005, the mortgage and housing business boomed as more and more capital found its way into housing. With lower rates, more people could afford to buy houses. That was good. Unfortunately, it didn't take long for some people to figure out that with rates so low, they could buy more than one. Or even nine or 10. As more money made its way into housing, prices for real estate went up – 20% a year for several years in some places. The higher prices created more equity... that could then be used as collateral for still more debt. This is what leads to a bubble. Banks, hedge funds, and insurance companies were happy to fund the madness because they believed new "financial engineering" could take lower-quality home loans (like the kind with zero down payment) and transform these very risky loans, made at the top of the market, into AAA-rated securities. Let me go into some detail about how this worked. Wall Street's biggest banks (Goldman Sachs, Lehman Bros., Bear Stearns) would buy, say, $500 million worth of low-quality mortgages, underwritten by a mortgage broker, like NovaStar Financial. The individual mortgages – thousands of them at a time – were organized by type and geographic location into a new security, called a residential mortgage-backed security (RMBS). Unlike a regular bond, whose coupon is paid by a single corporation and organized by maturity date, RMBS securities were organized into risk levels, or "tranches." Thousands of homeowners paid the interest and principal for each tranche. Rating agencies (like Moody's) and other financial analysts, believed these large bundles of mortgages would be safer to own because the obligation was spread among thousands of separate borrowers and organized into different risk categories that, in theory, would protect the buyers. For example, the broker (like NovaStar) that originated the mortgages would be on the hook for any early defaults, which typically only occurred in fraudulently written mortgages. After that risk padding, the next 3%-5% of the defaults would be taken out of the "equity slice" of the RMBS.
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