看来还是Feds的错！
Former U.S. Federal Reserve Board Chairman Alan Greenspan said "We had a bubble in housing",[32][33] and also said in the wake of the subprime mortgage and credit crisis in 2007, "I really didn't get it until very late in 2005 and 2006." In 2001, Alan Greenspan dropped interest rates to a low 1% in order to jump the economy after the ".com" bubble. It was then bankers and other Wall Street firms started borrowing money due to its inexpensiveness.[34]
