Rather than organizing their mortgage business around the GSEs, they set out to build integrated mortgage securitization businesses. Countrywide expanded from origination to securitization. A giant bank like Citi could envision itself as a provider at every stage, originating, securitizing, selling, holding and dealing in MBS. Even more remarkable was the evolution of investment banks like Lehman and Bear Stearns that had previously defined themselves through their remoteness from ordinary retail customers. Already in the 1990s Bear added the mortgage originator and servicer EMC to its
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