science progresses by trial and error, and when it is forbidden to admit error there can be no progress.

An economy may be in equilibrium from a short-period point of view and yet contain within itself incompatibilities that are soon going to knock it out of equilibrium.

Where is the pricing system that offers the consumer a fair choice between air to breathe and motor cars to drive about in?

Marxism is the opium of the Marxists.

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.

Rosa Luxemburg maintained that the capitalist system can keep up its rate of investment (and therefore its profits) only so long as it is expanding geographically.

The only thing worse than being exploited by capitalism is not being exploited by capitalism.