Summary John Locke intervened in two major debates in which the issue of species featured: (1) the question of whether species designations are based on real essences or only nominal essences (discussed in the Essay), and (2) the debate over the recoinage of English currency in the 1690s, in which Locke argued for a restoration of silver depleted by widescale clipping (discussed in his economic writings published between 1692-95). This article investigates Locke's position on the recoinage and considers alternative proposals in the period, including those which advocated the introduction of a new species of money in the form of credit, based on land. Locke opened the space, philosophically, for innovations in defining money, but endorsed a narrower conception of money as silver by weight alone (not by its stamp or denomination). His rationale for doing so exposes his attachment to shared systems of measurement, intersubjective agreement and ways of stabilizing meaning by reference to external criteria (in this case, the weight of silver, a measure that functioned internationally). This suggests a pattern of attempting to constrain the nominalism that his system otherwise foregrounded.
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