Economics homework help

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Consider the graph of indifference curve below.
 
                                  Y
                               36
 
                               28                 A
                                                            B
 
 
                                                                                                                         X
                                                                       18                                 47
 
(1) Compute MRSxy at Point A.
(2) Compute  MRSxy at Point B.
(3) What is the economic reason for MRSxy at Point B to be lower than MRSxy at Point A?
 
 
 
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