7. After watching a movie, Alan chooses not to watch a second and goes for a walk instead.
Economists could explain his choices using the concept of
(A) budget constraints.
(B) diminishing marginal utility.
(C) income effect.
(D) substitution effect.
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統計: A(1), B(1), C(0), D(0), E(0) #2789963
統計: A(1), B(1), C(0), D(0), E(0) #2789963