6. In a competitive equilibrium in an exchange economy with two individuals, if one individual is a net
demander of a good, then:
(A) one individual's marginal rate of substitution must exceed the other individual's marginal rate of
substitution
(B) the other individual must be a net supplier of that good
(C) the equilibrium is not Pareto-optimal.
(D) the other individual must also be a net demander of that good.
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