This article doesn't answer the question and seems primary based on nostalgia. My theory: the Fed's zero interest rate policy is very good at inflating asset values: S&P500, housing, you name it. Rising income is a second-order effect: we hope that rising asset values will lead to increased wages. That used to be the case, but no longer is. Why? Because of automation and globalization probably. So, the Fed has the pe…
http://www.usgovernmentspending.com/total_spending_chart
That wealth has to come from somewhere.