Activity in the non-agency jumbo market could play a big role in determining how to reform the government-sponsored enterprises, according to industry analysts. While policymakers consider what to do with Fannie Mae and Freddie Mac, some are calling for a larger role for the jumbo market as a test for GSE reform. Mark Willis, a resident research fellow at New York University’s Furman Center for Real Estate and Urban Policy, said the Federal Housing Finance Agency should increase the GSEs’ guaranty fees for ...