Fourthly , it discussed the application of the model mar ginal opportunity cost ( moc ) on water pricing , and at the same time , it estimated the composing elements : marginal production cost ( mfc ) , marginal user cost ( muc ) , and marginal environmental cost ( mec ) , and then evaluated the feasibility of the model , taking the water pricing of chibi city as the example 第五章重点论述边际机会成本定价模型在水资源定价中的应用，与此同时，对构成要素即边际生产者成本、边际使用者成本、边际环境成本进行了估算和评价；并以赤壁市水价为例，分析边际机会成本定价模型的准确性及可操作性。
A timed pricing model for power corporation with independent power source such as independent power plant and pumped storage is proposed as the result of study on electricity price , which is based on timed pricing form and marginal cost . electricity energy is considered as the commodity , the power corporation as modern enterprise 本文以有功电价为研究对象，针对带有独立电厂和抽水蓄能电厂等独立电源的电力公司，在综合分时电价形式和边际成本定价方法的基础上，提出其相应的分时电价模型。
Results of calibration of indicate that the ecologically accepted fertilizer dosage of shunyi district in 2002 was 328 . 27 kg / hmz while the actual one was 1034kg / hm2 . such a result was derived base on the externality and rules of marginal cost applying contingent valuation method of environmental economics , survey on the willingness to pay for harnessing water pollution caused by the waste water discharged by big farm was conducted 现阶段，左右顺义区土地利用生态服务价值的主要是耕地、林地、园地；根据环境经济学边际机会成本定价原理，结合顺义区2002年化肥施用造成的外部不经济性，推算顺义区2002年最佳生态化肥施用量是328 . 87kg hm ~ 2 。而顺义区目前化肥施用量1034kg hm ~ 2 ，属于严重超标状态。
