 A noncontentious elaboration of Newcomb’s problem posits that the agent’s choice and its prediction have a common cause. The agent’s choice is evidence of the common cause and evidence of the choice’s prediction. Once an agent acquires the probability of the common cause, he may put aside the evidence his choice provides about the prediction. That evidence is superfluous. Given the probability of the common cause, the probability of a prediction of one-boxing is constant with respect to his options. Similarly, the probability of a prediction of two-boxing is constant with respect to his options. Because the probability of a prediction is the same conditional on either option, the expected utility of two-boxing exceeds the expected utility of one-boxing according to evidential decision theory. Horgan (1981 [1985]) and Huw Price (1986) make similar points.