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Walt considers x and y to be perfect substitutes.They originally cost 10 and 9 respectively.His income is 720.One day the price of x drops to 8.Which of the following is true？

Walt considers x and y to be perfect substitutes.They originally cost 10 and 9 respectively.His income is 720.One day the price of x drops to 8.Which of the following is true？
A.The income effect increases the quantity of y by 90.
B.The substitution effect increases the quantity of y by 80.
C.The substitution effect increases the quantity of x by 90
D.The income effect increases the quantity of x by 80.
正确答案：The substitution effect increases the quantity of x by 90

标签：中级微观经济学

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