养分耗竭使利润循环停滞，阻碍个人、省份和国家经济以及粮食生产的增长(图2)。

Resource depletion helps stall the profit cycle and prevent growth in the personal, provincial and national economies, as well as in food production (Figure 2).

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循环流动图是经济的视觉模型，展示美圆（ 货币）是如何通过市场在家庭与企业之间流 动的。

Our First Model: The Circular-Flow Diagram The circular-flow diagram is a visual model of the economy that shows how dollars flow through markets among households and firms.

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