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—I wish I could. But I’m on my way out. I have to be in the city in an hour.—63

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—I wish I could. But I’m on my way out. I have to be in the city in an hour.

—63

参考答案:

E

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需求的弧弹性（Arc elasticity of demand）

需求的交叉弹性（Cross elasticity of demand）

需求的价格弹性（Price elasticity of demand）

供给的价格弹性（Price elasticity of supply)

单位弹性（Unitary elasticity）

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