The S&P 500 Index has hit a new landmark by reaching twice its financial crisis low -- the fastest the S&P has ever doubled -- driven in part by quantitative easing and low interest rates.

From the low of 666.79 on 9 March 2009, the S&P 500 closed at 1336.32 on Wednesday, doubling in just 1 year, 11 months and 8 days, almost one year faster that the its previous record.