1.0 Introduction
This post presents two approaches to fixed capital.
The first emphasizes power and convention. It emphasizes that the 'money world',
as Mason and Jayadev (2026) put it, is not a direct reflection of physical properties of production.
The second is much closer to a determined model, with one degree of freedom.
I have at least one previous post, more abstractly on these themes
2.0 Depreciation as Accounting Conventions and Mediated by the Exercise of Power
Robert Paul Wolff points out that how overhead costs are allocated is a political
exercise in many firms. Two managers on the same level might each be in charge of
the production of a specific product. Suppose these products are produced in the facility.
Each manager wants upper management to see that they are making the most profits for
the company. In is in the interest of each to see that as much of possible of the overhead
for running the facility is applied to their rival's department.
A given machine might be used in multiple production processes, resulting in the
production of different products. The allocation of overhead costs here follows the
above logic.
Sometimes (many times?), no fact of the matter exists for how to allocate costs.
As I understand it, the
Generally Accepted Accounting Principles (GAAP) includes different conventions for depreciation.
Some models I have seen assume radioactive decay so to speak. Tax law specifies what
can be allowed.
3.0 Depreciation and the Economic Life of Machines as an Aspect of Prices of Production
Another way of thinking about fixed capital is as in Sraffa (1960).
Enough equations are given for prices to be determined, corresponding to a given wage or rate of profits.
The data include inputs and outputs, in disaggregated physical terms, for all combinations of ages
of machines. These detailed specifications are not based solely on the age, but the entire history of
each machine.
Alessandro Roncaglia showed, back in the 1970s, that a countable infinity of equations can arise when
production processes can require inputs of combinations of machines. The theory of pure fixed capital
includes assumptions that rule out this possibility.
Sraffa derives the formula for an annuity from his treatment of a machine of constant efficiency.
But the analysis generalizes. This approach is in tension with the first approach.
4.0 Conclusion
I will continue exploring mathematical puzzles. I like to think that Sraffa presents the elements of an alternative
theory, not just an immanent critique of 'neoclassical' theory. The analysis points outside itself.
Reference
- Mason, J. W. and Arjun Jayadev. 2026. Against Money. University of Chicago.