Over eighty years ago, Keynes condemned the rentier and welcomed his future disappearance. Following in his footsteps, politicians and central bankers today are ever closer to effectively bringing this about.
Finn Kydland and Edward C. Prescott (KP), the 2004 Nobel laureates in economics think that technological shocks can explain 70 percent of economic fluctuations in postwar US data. Unfortunately their quantitative methods are simplistic and ignore the real problem: central banking.
There is productive consumption and there is non-productive consumption. In the Keynesian mind, it's not necessary to produce anything, so long as people spend and consume endlessly, even to the point of destroying real wealth.