I think it's basically the shrinking of the middle class and people with enough capital to contemplate starting a business. Looking at the number of business st

I think it's basically the shrinking of the middle class and people with enough capital to contemplate starting a business. Looking at the number of business starts shows an ever decreasing number - which correlates with the stagnation of wages and size of the middle class. Also linked, the number of hours worked has increased steadily, as well as a increase in both parents working, so availability of time in households to supply "labor capital" to start businesses has also shrank.