It is worth pointing out that in this particular study our authors have abandoned demand and supply functions as a tool for analysis, even as applied… - Tjalling Koopmans

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It is worth pointing out that in this particular study our authors have abandoned demand and supply functions as a tool for analysis, even as applied to individuals... [The problem] has been reformulated as one of proving that a number of maximizations of individual goals under interdependent restraints can be simultaneously carried out.