【柴知道】修地铁要“亏”多少钱？
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| MP4 | N/A | 480P | Download |
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| MP4 | N/A | mp4a.40.2 | Download |
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截至 2019 年底，中国内地已经有 40 个城市都修了地铁。都知道修地铁贵，但钱到底花在了哪里？一节车厢里挤了上百号人，能让地铁公司把钱挣回来么？我们翻了翻地铁公司的账本，希望从经济学的角度出发，来看看修地铁这门生意到底划不划算~
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