by Let me conclude the discussion of rational-choice theory by emphasizing again its radically subjective nature … The rationality of beliefs is a completely different matter from that of their truth. Whereas truth is a feature of the relation between the belief and the world, rationality is a feature of the relation between the belief and the evidence possessed by the agent. Although rationality may require the agent to invest in new information, the investment is always constrained by its expected (that is, believed) costs and benefits.
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Let me conclude the discussion of rational-choice theory by emphasizing again its radically subjective nature …
The rationality of beliefs is a completely different matter from that of their truth. Whereas truth is a feature of the relation between the belief and the world, rationality is a feature of the relation between the belief and the evidence possessed by the agent. Although rationality may require the agent to invest in new information, the investment is always constrained by its expected (that is, believed) costs and benefits.