What can we do to address our affordable housing crisis?

NPR's Fresh Air has an excellent interview with Wharton School economist Ben Keys on the causes of our current housing crisis.
'Keys notes that new construction is occurring "at a snail's pace," due, in part, to the high cost of labor and materials and the difficulty of financing large projects. He says that zoning laws and land use restrictions can also contribute to a housing shortage: "[These] policies create a lot of hoops to jump through and make it challenging for developers who would like to build at the scale where they would like to build."'