The scene was set for its occurrence by a number of developments. Here’s a partial list: Government policies supported an expansion of home ownership—which by definition meant the inclusion of people who historically couldn’t afford to buy homes—at a time when home prices were soaring; The Fed pushed interest rates down, causing the demand for higher-yielding instruments such as structured/levered mortgage securities to increase; There was a rising trend among banks to make mortgage loans, package them and sell them onward (as opposed to retaining them); Decisions to lend, structure, assign
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