The bare‐difference methodology is considered to be a powerful tool in ethical reasoning. The underlying idea is that we can identify the intrinsic evaluative significance of some feature by constructing contrast cases or bare‐difference cases, i.e., two cases that hold everything constant but for the feature of interest. While this popular methodology has been challenged by prominent philosophers such as Kagan, Thomson, and Kamm, it is intuitively appealing because, as Perrett identifies, the methodology appears to share the same logical structure (...) as a fruitful scientific procedure. In this paper, I argue that examining this ‘scientific analogy’ is crucial to understanding both the limitations and the prospects for ethical bare‐difference reasoning. I expand upon Perrett's discussion of the scientific analogy and examine another relevant similarity. I then highlight two relevant dissimilarities between ethical bare‐difference reasoning and its scientific analogue. Though these differences threaten to undermine the analogy, I show how the analogy might be mended to better bring the ethical methodology in line with its scientific counterpart and avoid challenges to ethical bare‐difference methodology raised by philosophers in the literature. (shrink)

Whether value is “additive,” that is, whether the value of a whole must equal the sum of the values of its parts, is widely thought to have significant implications in ethics. For example, additivity rules out “organic unities,” and is presupposed by “contrast arguments.” This paper reconsiders the significance of value additivity. The main thesis defended is that it is significant only for a certain class of “mereologies”, roughly, those in which both wholes and parts are “complete”, in the sense (...) that they can exist independently. For example, value additivity is significant in the case of a mereology of material objects, but not in the case of a mereology of propositions. (shrink)