Michal Kalecki's claim to priority of publication is indisputable. - Joan Robinson

Marx, however imperfectly he worked out the details, set himself the task of discovering the law of motion of capitalism, and if there is any hope of progress in economics at all, it must be in using academic methods to solve the problems posed by Marx.

It is the business of economists, not to tell us what to do, but show why what we are doing anyway is in accord with proper principles.

It seems that neither the Keynesian nor the Marxian prognosis of the future of capitalism is being fulfilled and we are left without any particular theory as to what will happen next.