What account can we give of the nature of the individuality of concrete particulars that allows many properties to inhere in them? Campbell argues that concrete particulars are bundles of tropes, or of instances of qualities. It is argued that we should individuate tropes spatiotemporally, as Schaffer suggests we should, and that such a spatiotemporal individuation principle makes Campbell’s model require that the Identity of Indiscernibles be a necessary truth, which he rejects.

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