Great Expectations. Part I: On the Customizability of Generalized
  Expected Utility
  We propose a generalization of expected utility that we call generalized EU
(GEU), where a decision maker's beliefs are represented by plausibility
measures, and the decision maker's tastes are represented by general (i.e.,not
necessarily real-valued) utility functions. We show that every agent,
``rational'' or not, can be modeled as a GEU maximizer. We then show that we
can customize GEU by selectively imposing just the constraints we want. In
particular, we show how each of Savage's postulates corresponds to constraints
on GEU.
