David Lewis's extended defense of modal realism — the view that all possible worlds are equally real concrete universes — and its applications to the analysis of modality, counterfactuals, causation, properties, and propositions.
Defends genuine modal realism against alternatives (ersatzism); argues that the explanatory benefits of concrete possible worlds (analysis of modality, properties as sets of possibilia, propositions as sets of worlds) outweigh the ontological cost.
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