Mortgage-Backed Securities and the Financial Crisis of 2008: a Post Mortem /

Ospina, Juan.

Mortgage-Backed Securities and the Financial Crisis of 2008: a Post Mortem / Juan Ospina, Harald Uhlig. - Cambridge, Mass. National Bureau of Economic Research 2018. - 1 online resource: illustrations (black and white); - NBER working paper series no. w24509 . - Working Paper Series (National Bureau of Economic Research) no. w24509. .

April 2018.

We examine the payoff performance, up to the end of 2013, of non-agency residential mortgage-backed securities (RMBS), issued up to 2008. We have created a new and detailed data set on the universe of non-agency residential mortgage backed securities, per carefully assembling source data from Bloomberg and other sources. We compare these payoffs to their ex-ante ratings as well as other characteristics. We establish seven facts. First, the bulk of these securities was rated AAA. Second, AAA securities did ok: on average, their total cumulated losses up to 2013 are 2.3 percent. Third, the subprime AAA-rated segment did particularly well. Fourth, later vintages did worse than earlier vintages, except for subprime AAA securities. Fifth, the bulk of the losses were concentrated on a small share of all securities. Sixth, the misrating for AAA securities was modest. Seventh, controlling for a home price bust, a home price boom was good for the repayment on these securities. Together, these facts provide challenge the conventional narrative, that improper ratings of RMBS were a major factor in the financial crisis of 2008.




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