When valuing a stock, it is hard enough to work out how many sports cars, aeroplanes or pairs of jeans the world will want years from now. But how about estimating the cash flows from putting a million humans on Mars?
在对一只股票进行估值时，预测未来几年世界需要多少跑车、飞机或牛仔裤就已经够难了。那么，如何估算将100万人送上火星所带来的现金流呢？
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