ON CAPITAL, TIME AND THE NEOCLASSICAL PARABLES

Many of the paradoxes in capital theory arise from seeking a purely 'physical' measure for the aggregate stock of capital. Several recent papers made it clear that heterogeneous capital outfits cannot be measured by a single aggregate index which is independent of the rate of interest. This paper defines and proves the general properties of an index of capital intensity — the degree of 'roundaboutnes'— which admits both the physical and the time dimensions of capital. A modified form of the neoclassical parables is defined and proved to be universally valid despite reswitching.