Dias, LuísSarabando, Paula2015-03-162015-03-162012http://hdl.handle.net/10400.19/2684Arrow proposed a set of conditions for a function to aggregate ordinal preferences of the members of a group, proving that it was not possibl e to satisfy all these assumptions simultaneously. Later, Keeney adapted these conditions and proposed a cardinal utility axiomatization for the problem of aggregating the utility functions. This work dis cusses the condition of nondictatorship. It propose s a stronger formulation for this condition and prese nts the corresponding characterization of group cardinal utility functions.porUtility functionsAxiomatizationArrow’s theoremconference object