Skills that are monopolizable are anathema to capital.

Perpetual revolutions in technology can mean the devaluation of fixed capital on an extensive scale.

Because the earth is not a product of labour it cannot have a value.

The equilibrium between supply and demand is achieved only through a reaction against the upsetting of the equilibrium.

Speculation in land may be necessary to capitalism, but speculative orgies periodically become a quagmire of destruction for capital itself.

Marx set out to resolve the contradictions and to correct the errors in classical political economy. In this he thought he had succeeded very well. Judging by the sound and the fury of the controversy surrounding his interpretations, he either succeeded too well or deluded himself to the success of his enterprise.

All rent is based on the monopoly power of private owners of certain portions of the globe.