““Lewis famously advocated a metaphysical methodology based on subjecting rival hypotheses to a cost-benefit analysis. Usually there are two kinds of cost associated with accepting a metaphysical thesis. The first is accepting some kind of entity into one's ontology, for example, abstracta, possibilia, or a relation of primitive resemblance. The second is relinquishing some intuitions, for example, the intuition that causes antedate their effects, that dispositions reduce to categorical bases, or that facts about identity over time supervene on facts about instants of time. It is taken for granted that abandoning intuitions should be regarded as a cost rather than a benefit.””
