Fairness: Producing food should not impose costs on others.
公平：生产粮食不应强加给别人的费用。
Negative Externalities: Sometimes markets impose costs on others who are not directly participating in the market.
负外部性：有时候，市场强加成本于其他不直接参与到这个市场的人之上。
Negative Externalities: Sometimes markets impose costs on others who are not directly participating in the market.
负外部性：有时候，市场强加成本于其他不直接参与到这个市场的人之上。
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