http://www.bloomberg.com/news/articles/2016-04-27/be-afraid-be-very-afraid-if-you-re-investing-for-the-long-run
McKinsey Report -
http://www.mckinsey.com/industries/private-equity-and-principal-investors/our-insights/why-investors-may-need-to-lower-their-sights
Related:
US Equity Markets – Bulls versus Bears
http://www.bloomberg.com/news/articles/2016-04-28/obama-bull-market-dodges-knock-out-blows-to-stagger-into-history
http://www.bloomberg.com/news/articles/2016-04-28/obama-bull-market-dodges-knock-out-blows-to-stagger-into-history