Understanding the nonadditive probability decision model
The pioneering research of Schmeidler   and others identified behavioral axioms that underlie preferences consistent with the maximization of Choquet expected utility. However, these theories do not clarify the link between the epistemics of the decision maker's (DM) problem and his choice. This paper shows that if the DM is aware that his anticipation and perception of future contingencies is incomplete, then his subjective beliefs will be described by a nonadditive probability specification. Further, if the DM acts with a certain notion of caution given the incompleteness in his understanding of the environment, his preferences over acts may have a Choquet expected utility representation. The model developed here thus provides a justification of such beliefs and preferences based on "procedural rationality". The formalism also allows a simple characterization of how belief representation may change as the DM acquires a clearer picture of the contingency space underlying the uncertain environment.
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