Suppose one observes that when the price of peanut butter increases, the demand for jelly increases. One must conclude that:

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Suppose one observes that when the price of peanut butter increases, the demand for jelly increases. One must conclude that:

A.peanut butter and jelly are complements.

B.peanut butter and jelly are inferior goods.

C.peanut butter and jelly are normal goods.

D.peanut butter and jelly are substitutes.

正确答案:peanut butter and jelly are substitutes.

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