http://www.nytimes.com/2012/10/24/us/politics/race-for-president-leaves-income-slump-in-shadows.html
The corporate sector is less enthused about US/global
economic conditions
Low Interest Rates and the Direction of US Equities
http://www.economist.com/news/finance-and-economics/21564845-low-real-interest-rates-are-usually-bad-news-equity-markets
http://www.economist.com/news/finance-and-economics/21564845-low-real-interest-rates-are-usually-bad-news-equity-markets
Also, see Robert Shiller on the US Equity Valuations