The severity of the recent sub-prime financial crisis and housing crash has been without parallel since the Great Depression. What happened? How did the markets collapse? How can similar situations be prevented in the future. Mark Zandi, Chief Economist and co-founder of Moody’s Economy, explores these questions in plain English in his new book Financial Shock: A 360º Look at the Subprime Mortgage Implosion, and How to Avoid the Next Financial Crisis.