The common denominator [of Keynesianism] is economic statism. That is, the assumption that the state, including its central banking branch, is indispensable to economic progress and prosperity."The Keynesian House Of Denial." By David Stockman. Stockman's Corner, 4/16/16.
As the various denominations of the Keynesian economic church have it, capitalism is always veering toward the ditch of under-performance and recession when left to its own devices and natural tendencies; and, if neglected by the wise policy-makers of the central state too long, it lapses toward outright depression and collapse.