Columbia Business School Professor Chris Mayer discusses why his plan with Dean Glenn Hubbard to lower mortgage rates will not only provide a sizeable economic stimulus but also stem the decline in house prices, protecting the government — and taxpayers — from future losses. "Fundamentally, our proposal is about restoring normally functioning credit markets," says Mayer. Learn more at http://www4.gsb.columbia.edu/realestate/research/housingcrisis