Days before the government stepped in to rescue Fannie Mae and Freddie Mac, Knowledge@Wharton chatted with Mark Zandi, the chief economist and cofounder of what is now Moody\'s Economy.com, about his new book, Financial Shock: A 360-Degree Look at the Subprime Mortgage Explosion, and How to Avoid the Next Financial Crisis. business, crisis, economics, explosion, Fannie, financial, Freddie, Mac, Mae, Mark, mortgage, science, social, Subprime, Zandi