decision theory
US /dɪˈsɪʒ.ən ˌθiː.ə.ri/
UK /dɪˈsɪʒ.ən ˌθiː.ə.ri/

1.
théorie de la décision
a theory concerned with the process of making choices, especially under conditions of uncertainty, by analyzing the possible outcomes and their probabilities
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In economics, decision theory helps explain consumer choices.
En économie, la théorie de la décision aide à expliquer les choix des consommateurs.
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He is studying decision theory as part of his master's degree.
Il étudie la théorie de la décision dans le cadre de son master.