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    In this dissertation, I argue that David Lewis' abductive argument for Genuine Modal Realism has the unwelcome, and hidden, implication of being unable to accommodate agent causation theories of free will. This is because of his formulation of plenitude, which basically says that every way that a world or a part of a world could be is the way that some world, or part of some world is. This formulation tacitly assumes that chance and nomological principles are sufficient to account for everything…Read more