Let MUa and MUb stand for the marginal utilities of apples and bagels. Let Pa and Pb stand for their prices. The general necessary condition for consumer equilibrium is
A) MUa = MUb.
B) MUa = MUb and Pa = Pb.
C) MUa/Pa = MUb/Pb.
D) MUa/MUb = Pb/Pa.
C
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