本文讨论在供应商和销售商的边际成本都随产量递增的情况下，回购契约是如何协调供应链的。
This paper researches the buy back contract how to coordinate the supply chain on the condition that the suppliers and the retailers marginal costs increase with their outputs.
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.
高科技企业科技要素投入的边际递增性和边际成本趋于零；
The margin income and margin cost of technology element are zero;
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