Before revision:  We calculate corresponding cross-correlation functions averaged over all stocks for 71 historical stock prices from the Standard & Poor's 500 index for 1992--2013. The provided analysis suggests that cross-correlations maximum value increases near periods of crisis and remains close to 1 since the US housing bubble in 2007.
After revision:  We calculate corresponding cross-correlation functions averaged over all stocks for 71 historical stock prices from the Standard & Poor's 500 index for 1994--2013. We focus on the behavior of the cross-correlations maximum value increases near periods of crisis and remains close to 1 since the US housing bubble in 2007.