薛兆丰经济学讲义 · highlighted by fengyukongzhou

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薛兆丰

前些年我们国家修了好多高铁，高铁的平均时速如果从每小时250公里提升到每小时350公里，多提高的这么一点速度，建造的成本就要大幅增加，这大幅增加的成本到底合不合算？

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