Colas and root beer are substitutes, and a fall in the price ofroot beer (resulting in an increase in the consumption of root beer) will tend to decrease the demandfor colas.

可乐和根啤是替代品，根啤价格的下降（因而引起根啤的消费量增加）会减少可乐的需求量。

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Colas and root beer are substitutes, and a fall in the price ofroot beer (resulting in an increase in the consumption of root beer) will tend to decrease the demandfor colas.

可乐和根啤是替代品，根啤价格的下降（因而引起根啤的消费量增加）会减少可乐的需求量。

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