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This philosopher cited the decision theory of Gibbard and Harper in a defence of two-boxing Newcomb's problem in the paper "Why Ain'cha Rich?" This philosopher claimed that, ignoring inadmissible evidence, if a rational believer knows that the chance of some event E is X, then she will believe to degree X that E will occur. This thinker revised that principle, called the Principal Principle, because of its conflict with a doctrine of his that claims "the world is a vast mosaic of local matters of particular fact." This originator of (*) Humean Supervenience attacked three forms of ersatzism in a chapter called "Paradise on the Cheap?" from a book which uses counterpart theory to support his thesis that possible worlds are causally isolated from each other and exist in the same sense that our world exists. For 10 points, name this philosopher who argued for modal realism in On the Plurality of Worlds.
This philosopher cited the decision theory of Gibbard and Harper in a defence of two-boxing Newcomb's problem in the paper "Why Ain'cha Rich?
David (Kellogg) Lewis