In reality, the picture is complicated by the substitution in both supply and demand among different agricultural commodities, and by the role of the corn ethanol program.
实际上，在供求两个方面都有不同农产品作替换，加之玉米乙醇项目的实施，导致上述简单的关系变得复杂化。
The concept of anticipation and change, which underlie the principles of supply and demand, substitution, balance, and externalities, are basic to the sales comparison approach.
依据供求原则、替代原则、平衡原则和外部性原则的预期的概念和变化的概念是市场途径的基础。
With the help of game theory, and the use of supply and price as variable of policy decision, the paper studies the energy substitution issue by a two-stage dynamic game model.
以博弈论为研究工具，以供应量和价格为决策变量，通过两阶段动态博弈模型，对能源之间的替代问题进行了研究。
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