No More Learning

Neoclassical parables 69
concrete and material' and whose appearance as value is 'an abstract quantum of productive wealth' (1899: 116, 119); Irving Fisher takes capital as           to the prevailing stock of wealth (1906: 52); Frank Knight sees capital as 'consisting of non-human productive agencies' (1921: 328); while Arthur Pigou conceives of capital as a heterogeneous material entity 'capable of maintaining its quantity while altering its form' (1935: 239).