This paper addresses the so-called ‘truthmaker problem’ or ‘grounding problem’ for presentism. In section 1, I set the stage by introducing presentism and the truthmaker problem. In section 2, I consider a proposed solution to it, which I call the ‘laws of nature proposal’ (LNP), recently defended by Markosian (2013). I argue that LNP fails as a solution to the truthmaker problem because it does not meet a constraint that is generally taken as constitutive of it: that the entities doing truthmaker work should be categorical. Then, in section 3, I discuss the prospects of abandoning this ‘categoricity constraint’. The conclusion of this discussion is that the presentist should be allowed to such a move. This, however, is not completely good news for the friends of LNP, since the abandonment of the ‘categoricity constraint’ opens the door to simpler solutions, like what is often called ‘Lucretianism’.
Laws of nature, presentism, truthmaking
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