The production possibility frontier at different horizons is in different places.
不同层面的生产可能性曲线,会有不同的位置
you're in 3 different places at New York.
你就要去纽约的3个不同的地方。
And so from now on,Shelly Kagan,that single person, is in two different places at the same time.
所以从现在开始,Shelly,Kagan一个人,同时身处两处。
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