Three Ontological Options for the Laws of the Best System

What, ontologically speaking, are best system laws? Should the laws of the best system account be identified with sentences, or propositions, or perhaps something else? These questions differ from more familiar questions about which criteria we should use to pick out the best system laws: regardless of whether laws are picked out using simplicity, informativeness, tractability, predictability, perfect naturalness, or whatever, there remains the question of what, ontologically, the best system laws are. But very little has been written on this issue; and what has been written is often ambiguous. So in this paper, we present and evaluate three ontological options for best system laws: taking them to be sentences, unstructured propositions, and structured propositions. Surprisingly, the two most cited options—sentences and unstructured propositions—face significant problems. Defenders of the best system account might want to take seriously the idea that best system laws are structured propositions.