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How Government Stoked the Mania
...Part of this story is true. The fall in housing prices did lead to a sudden increase in defaults that reduced the value of mortgage-backed securities. What's missing is the role politicians and policy makers played in creating artificially high housing prices, and artificially reducing the danger of extremely risky assets.

Beginning in 1992, Congress pushed Fannie Mae and Freddie Mac to increase their purchases of mortgages going to low and moderate income borrowers. For 1996, the Department of Housing and Urban Development (HUD) gave Fannie and Freddie an explicit target -- 42% of their mortgage financing had to go to borrowers with income below the median in their area. The target increased to 50% in 2000 and 52% in 2005.

For 1996, HUD required that 12% of all mortgage purchases by Fannie and Freddie be "special affordable" loans, typically to borrowers with income less than 60% of their area's median income. That number was increased to 20% in 2000 and 22% in 2005. The 2008 goal was to be 28%. Between 2000 and 2005, Fannie and Freddie met those goals every year, funding hundreds of billions of dollars worth of loans, many of them subprime and adjustable-rate loans, and made to borrowers who bought houses with less than 10% down....

...The Community Reinvestment Act (CRA) did the same thing with traditional banks. It encouraged banks to serve two masters -- their bottom line and the so-called common good. First passed in 1977, the CRA was "strengthened" in 1995, causing an increase of 80% in the number of bank loans going to low- and moderate-income families.

Fannie and Freddie were part of the CRA story, too. In 1997, Bear Stearns did the first securitization of CRA loans, a $384 million offering guaranteed by Freddie Mac. Over the next 10 months, Bear Stearns issued $1.9 billion of CRA mortgages backed by Fannie or Freddie. Between 2000 and 2002 Fannie Mae securitized $394 billion in CRA loans with $20 billion going to securitized mortgages.

By pressuring banks to serve poor borrowers and poor regions of the country, politicians could push for increases in home ownership and urban development without having to commit budgetary dollars. Another political free lunch....