 Even though B1+ is better than B1, both B1+ and B1 may be incommensurable with B2. But if B1 is incommensurable with B2, then Abraham could, once at the foot of the mountain, easily decide to opt for B1 over B2. Given that B1 is worse than B1+, Abraham could thus easily end up with an outcome that is worse than another that was available to him, even if each of his choices makes sense given the value of the alternatives he faces.