Hurley compares Nozick's discussion of Newcomb's problem in The Nature of Rationality to his earlier discussion in Newcomb's Problem and Two Principles of Choice. He is unsatisfied with Nozick's later analysis of people's choosing different decision strategies depending on the amount of money in the first box in Newcomb's problem. Hurley argues that this might be understood not as a conflict between causal and evidential reasoning, as Nozick would have it, but between causal and cooperative reasoning.