Abstract

One metaphysical problem about laws is how to find appropriate truthmakers for fully general functional laws. What makes it true, for instance, that an uninstantiated mass would interact with others as prescribed by laws concerning mass? This is the missing value problem. D. M. Armstrong attempted to solve it by appeal to determinable universals. I will offer a trope‐theoretic solution that, while in some ways more metaphysically adventurous than Armstrong's view, avoids commitment to universals and determinables (as different from their determinates). The solution makes use of a special conception of tropes as capable of intrinsic change. It also makes use of a distinction between two ways of having a causal power (a distinction we should make in any case). Existing powers‐based approaches to the problem struggle to avoid the idea that powers mysteriously point beyond themselves. But if tropes are capable of intrinsic change in the way I propose, they can account for the full generality of laws with minimal pointing beyond, and can do so while retaining natures that are credibly intrinsic.