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
Irving Fisher also drew on the curve a production possibility frontier for society, which he made downward-curved.
欧文·费雪还画了一条曲线,代表了社会的生产可能性边界PPF,这是一条向下的曲线
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