In a statement to the Congressional Hearing, Alan Greenspan, the former chairman of the Federal Reserve, defended his policy on interest rates and placed the blame for the recent crash on the fact that most new mortgages in the final years of the property boom were securitized. According to Mr. Greenspan: “By the first quarter of 2007, virtually all sub-prime originations were being securitized, and sub-prime mortgage securities outstanding totalled more than $900bn.” An economist of equal weighting and stature, Mark Zandi, chief economist of Moody's Analytics, countered Mr. Greenspan’s comments by suggesting to the hearing that “aggressive monetary policy...