 Briefly, the economic explanation of decisions states simply that the agent chooses the feasible option that she ranks most highly according to her “preferences.” “Preference” is a technical term, not a psychological concept. By definition, a preference is a linear order over some domain of objects. A linear order is complete, asymmetric, and transitive. Less formally, we may understand preference as a relation “at least as preferred as” over the relevant domain. Completeness requires that, for any two objects a, b, either a is at least as preferred as b or b is at least as preferred as a. Asymmetry states that if a is at least as preferred as b and b is at least as preferred as a then a is indifferent to b. Finally transitivity requires that if a is at least as preferred as b and b is at least as preferred as c then a is at least as preferred as c. 