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Working Paper
GSEs, mortgage rates, and the long-run effects of mortgage securitization
Our paper compares mortgage securitization undertaken by government-sponsored enterprises (GSEs) with that undertaken by private markets, with an emphasis on how each type of mortgage securitization affects mortgage rates. We build a model illustrating that market structure, government sponsorship, and the characteristics of the mortgages securitized are all important determinants of mortgage rates. We find that GSEs generally--but not always--lower mortgage rates, particularly when the GSEs behave competitively, because the GSEs' implicit government backing allows them to sell securities ...