Suppose that if the price of plane tickets increased, more people would choose to travel by train. If this happened, you would know that:

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Suppose that if the price of plane tickets increased, more people would choose to travel by train. If this happened, you would know that:

A.plane tickets are an inferior good.

B.the cross-price elasticity between plane tickets and train tickets is positive.

C.plane tickets and train tickets are complements.

D.the cross-price elasticity between plane tickets and train tickets is negative.

正确答案:the cross-price elasticity between plane tickets and train tickets is positive.

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