When I came up to Cambridge (in October 1921) to read economics, I did not have much idea of what it was about.

owning capital is not a productive activity.

The first essential for economists ... is to ... combat, not foster, the ideology which pretends that values which can be measured in terms of money are the only ones that ought to count.

economics limps along with one foot in untested hypotheses and the other in untestable slogans.

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.

In all the talk in the Principles (as opposed to the formal analysis) it is not the saving of rentiers but the energy of entrepreneurs which governs accumulation.

Capital' is not what capital is called, it is what its name is called.