 The most common objection to causal decision theory is that it yields the wrong choice in Newcomb’s problem. It yields two-boxing, whereas one-boxing is correct. Terry Horgan (1981 [1985]), Paul Horwich (1987: Chap. 11), and Caspar Hare and Brian Hedden (2016) for example, promote one-boxing. The main rationale for one-boxing is that one-boxers fare better than do two-boxers. Causal decision theorists respond that Newcomb’s problem is an unusual case that rewards irrationality. One-boxing is irrational even if one-boxers prosper. Bales (2018) rejects the argument that two-boxing is irrational