Mereological Nihilism: Keeping It Simple

(Mereological) nihilism states that there are no composite objects—there are only sub‐atomic particles such as quarks. Nihilism's biggest rival, (mereological) universalism, posits vast numbers of composite objects in addition to the sub‐atomic particles, and so nihilism appears to be the more ontologically parsimonious of the two theories. If this is the case, it's a significant result for the nihilist: ontological parsimony is almost always thought to be a theoretical virtue, so a nihilist victory in the parsimony stakes gives us a defeasible reason to be nihilists. But things aren't so straightforward. Karen Bennett (2009) has argued that nihilism is no more quantitatively parsimonious than universalism. Furthermore, her argument can be redirected so that it threatens the nihilist's perceived advantage over universalism in the qualitative parsimony stakes too. I here argue that these arguments are flawed and that nihilism is indeed more quantitatively and qualitatively parsimonious than universalism.