Irving Fisher also drew on the curve, a productionpossibilityfrontier for society, which he made downward-curved.
欧文·费雪还画了一条曲线，一条社会的生产可能性边界，他让它向下弯曲。
2
Irving Fisher also drew on the curve a productionpossibilityfrontier 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P PF，这是一条向下的曲线。
3
But if we have credit markets, then people can individually choose to be off the productionpossibilityfrontier and at a higher level of consumption than otherwise would.