Generalized Goodwin’s Theorems on General Coordinates

  • Yuji Aruka


This paper is concerned with providing foundations for the use of general coordinates in linear production systems, which Professor R. M. Goodwin originally proposed. The actually observed sectors of the Sraffa–Leontief system have bilateral relations to each other, which leads to complexities in analyzing prices or quantities. In the case that it is impossible to proceed with analysis directly in the original space, we may turn to an imaginary space, which is tractable, as long as the original space corresponds uniquely to the imaginary one adopted. This is a natural way for mathematics to proceed. Goodwin’s use of the method of general coordinates represents a “diffeomorphisrn” in this area of economic theory. The use of general coordinates in the Sraffa–Leontief system seems, at first glance, restrictive, since their use requires a diagonalizable input matrix. A mathematical meaning of diagonalizability (or the rank condition) is examined by means of linear perturbation. The eigenvalues of the linear perturbed system are seen to be distinct almost everywhere. Economic meaning is given to the diagonalizable input matrix as yielding a regular system. It is worth noting that this specification can be justified in essentially the same way as the notion of quasi-smoothness used by Mas-Colell in the neoclassical production set. As a by-product of this study, the perturbed version of the Sraffa–Leontief price system is analysed.


Price System Input Matrix Principal Eigenvalue Linear Perturbation Regular System 
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© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Faculty of CommerceChuo UniversityTokyoJapan

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