(A) X must equal Y.
(B) MU(X) must equal MU(Y).
(C) MU(X) may equal MU(Y), but it is not necessarily so.
(D) X and Y must be substitutes.
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(A) X must equal Y.
(B) MU(X) must equal MU(Y).
(C) MU(X) may equal MU(Y), but it is not necessarily so.
(D) X and Y must be substitutes.