US equity markets largely driven by share buyback programs of corporations:
http://www.bloomberg.com/news/articles/2016-03-14/there-s-only-one-buyer-keeping-the-s-p-500-s-bull-market-alive
http://www.bloomberg.com/news/articles/2016-03-14/there-s-only-one-buyer-keeping-the-s-p-500-s-bull-market-alive