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The expected utility model developed by John von Neumann and Oskar Morgenstern dominated decision theory from its formulation in 1944 until the late 1970 s , not only as a prescriptive , but also as a descriptive model , despite powerful criticism from Maurice Allais and Daniel Ellsberg who showed that , in certain choice problems , decisions were usually inconsistent with the axioms of expected utility theory .
 person: John von Neumann; person: Oskar Morgenstern; person: Maurice Allais; person: Daniel Ellsberg
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: John von Neumann, Oskar Morgenstern, Maurice Allais, Daniel Ellsberg 
Answer:
 person: John von Neumann; person: Oskar Morgenstern; person: Maurice Allais; person: Daniel Ellsberg