在油田开采中后期，随着油田开发程度的加深，措施作业边际产量递减，措施作业边际费用递增，措施作业增量边际成本递增。
In the middle-late stages of production, as the deepening of the oil field development, the marginal operation output decrease, the cost increases, and the investment increase, too.
消费者基于消费效用最大化的目标实施消费行为，面对商场繁杂的促销形式会依据机会成本、边际效用递减规律等原理选择与黄牛党进行交易。
Confronted with the complicated forms of sales promotions conducted by sellers, consumers will trade with scalpers under the rules of opportunity cost, diminishing marginal utility and other theo.
产出越大，平均成本越低；当平均成本是产出递减函数时，边际成本总是低于平均成本。
When average costs decline in output, marginal cost is always less than average cost.
产出越大，平均成本越低；当平均成本是产出递减函数时，边际成本总是低于平均成本。
When average costs decline in output, marginal cost is always less than average cost.
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