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经济制度是
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下列问题哪一个属于微观经济学的研究范畴？
In ________, the seller charges different amounts to different classes of buyers.
When museums charge a lower admission fee to students and senior citizens, this form of price discrimination is known as ________ pricing.
When Coca-Cola carries a different price depending on whether the consumer purchases it in a fine restaurant, a fast-food restaurant, or a vending machine, then this form of price discrimination is known as ________ pricing.
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