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question 1 :Why do functions with DEcreasing marginal utility in each good bow inward/toward the origin....

question 1 :Why do functions with DEcreasing marginal utility in each good bow inward/toward the origin. Draw a diagram and how that shape captures diminishing MU in both goods.  

question2 : Consider the utility function with U = 4X0.25Y0.50
a. What is the marginal utility of X?
b. What is the marginal utility of Y?
c. What is the marginal rate of substitution?

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