Q&A Mark Calabria

IF YOU HAVE a mortgage on your home, the odds are that it's backed by one of two congressionally chartered, government-sponsored enterprises (GSES), Fannie Mae and Freddie Mac.

- 

Those agencies buy up mortgages, bundle them into securities, and then sell those to investors. Defenders of the GSEs say they're important for boosting homeownership generally and sustaining the standard 30-year fixed-rate mortgage specifically. Critics argue they serve mostly to make the financial system riskier and more statist.

One such critic is Mark Calabria, the former head of the Federal Housing Finance Agency that has acted as conservator of the GSEs since 2008. In an interview with Reason's Christian Britschgi, he argues that Fannie and Freddie do little to expand homeownership.

Q: Supporters of Fannie Mae and Freddie Mac argue that they're essential for sustaining the 30-year, fixed-rate mortgage-a product a lot of people like. Do you agree with that?

A: Let's start by reminding ourselves what is special about the 30-year fixed-rate mortgage. Obviously the most special part is, it's fixed for 30 years.

The risky part of that-from the lender's perspective-is interest rate risk. The important point here is Fannie and Freddie don't protect against interest rate risk; they protect against credit risk. What they are guaranteeing you against is that the borrower won't repay.