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【单选题】
Bob and Ray are thinking of buying a sofa. Bob's utility function is UB(S; MB) = (1+S)MB and Ray's utility function is UR(S,MR) = (4+S)MR ; where S = 0 if they don't get the sofa and S = 1 if they do and where MB and MR are the amounts of money they have respectively to spend on their private consumptions. Bob has a total of $1,600 to spend on the sofa and other stuff. Ray has a total of $ 2,000 to spend on the sofa and other stuff. The maximum amount that they could pay for the sofa and still arrange to both be better off than without it is:A.
1800
B.
500
C.
650
D.
1200
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