`Why Ain'cha Rich?'

Abstract

Some think that in (a suitable version of) Newcomb's problem, it is rational to take only one box. These one-boxers think of the situation as a choice between a million and a thousand. They are convinced by indicative conditionals: if I take one box I will be a millionaire, but if I take both boxes I will not. Their conception of rationality may be called V-rationality; they deem it rational to maximize V, that being a kind of expected utility defined in entirely non-causal terms. Their decision ,theory is that of Jeffrey [2]. Others, and I for one, think it rational to take both boxes. We two-boxers think that whether the million already awaits us or not, we have no choice between taking it and leaving it. We are convinced by counterfactual conditionals: If I took only one box, I would be poorer by a thousand than I will be after taking both. (We distinguish nornal from back-tracking counterfactuals, perhaps as in [4], and are persuaded only by the former.) Our conception of rationality is U-rationality; we favor maximizing U, a kind of expected utility defined in terms of causal dependence as well as credence and value. Our decision theory is that of Gibbard and Harper [ 1 ], or something similar. The one-boxers sometimes taunt us: if you're so smart, why ain'cha rich? They have their millions and we have our thousands, and they think this goes to show the error of our ways. They think we are not rich because we have irrationally chosen not to have our millions. We reply that we never were given any choice about whether to have a million. When we made our choices, there were no millions to be had. The reason why we are not rich is that the riches were reserved for the irrational. In the words of Gibbard and Harper [1],

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