Joseph Stiglitz describes the changes in the rules undergirding the American economy over the past 40 years that have promoted short-term profit taking as opposed to long-term investments and their impacts in slowing the growth of the American economy. http://rooseveltinstitute.org/rewriting-rules-report.
The average stock was held for seven years in 1940, for two years in 1987 and for seven months by 2007. Corporate CEO pay as compared to the average worker’s salary has grown from 20/1 in 1965 to 295/1 in 2013. Firms are not investing their capital in equipment needed and designed to increase worker productivity, but rather in stock buy-backs and shareholder dividends.