Lately, the Obama administration has been talking up a proposal to get Fannie Mae and Freddie Mac to knock down the barriers keeping underwater homeowners from refinancing their mortgages. Columbia University’s Glenn Hubbard, who led the Council of Economic Advisers under President George W. Bush, is calling for a more ambitious version of the program.

Read more: WASHINGTON POST - Ezra Klein 'How much would mass refinancing do for the economy?'