一个理性的决策者只有当一个行动的边际利润大于边际成本时，才会采取这项行动。
A rational decisionmaker takes an action if and only if the marginal benefit of the action exceeds the marginal cost.
只要开办新店的收益大于其建设成本，麦当劳就能以任何竞争对手都望尘莫及的方式赚取利润。
Ex. 5 as long as the returns from new stores were higher than its building costs, McDonald's profited in ways that none of its competitors could match.
只要开办新店的收益大于其建设成本，麦当劳就能以任何竞争对手都望尘莫及的方式赚取利润。
Ex. 5 as long as the returns from new stores were higher than its building costs, McDonald's profited in ways that none of its competitors could match.
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