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Differential rent in the 1760s: two neglected French contributions

Possibly the earliest contribution to the theory of differential rent is contained in C.-F.-J. d'Auxiron's Principes de tout gouvernement (1766). Two years later, in 1768, another discussion of the phenomenon of extensive differential rent appeared in the physiocratic periodical Ephémérides du citoyen, probably written by J.-N.-M. de Saint-Peravy. This article, while remaining a short and isolated contribution, indicates how differential payments for the use of land can be incorporated within a value theory in which normal prices reflect necessary costs of production and how differential rent can be reconciled with the explanation of rent as a return on capital.