 Some theorists hold that one-boxing is plainly rational if the prediction is completely reliable. They maintain that if the prediction is certainly accurate, then choice reduces to taking \(\$M\) or taking \(\$T\). This view oversimplifies. If an agent one-boxes, then that act is certain to yield \(\$M\). However, the agent still would have done better by taking both boxes. Dominance still recommends two-boxing. Making the prediction certain to be accurate does not change the character of the problem. Efficacy still trumps auspiciousness, as Howard Sobel (1994: Chap. 5) argues.