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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The part that involves policy and rules is deciding whether or not the controls can be static or whether some of the characteristics change over time or some other business variable.

涉及策略和规则的部分是决定控制是静态的，还是某些特征会随时间或其他业务变量而变动。

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The optimal capital structure function is alsogiven. which includes the variable of macroeconomic policy.

给出了包含宏观政策变量的最优资本结构函数关系式；

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There's something called "variable life," which refers to a life insurance policy where the policyholder can make decisions about the investment of the money in the whole life policy.

有种保单叫做"可变寿险",作为终身寿险的一种,投保人可以自主选择,在终身寿险上进行多少投资

耶鲁公开课 - 金融市场课程节选

Bottom line, the budgetary rules treating growth as a given instead of the all important variable for achieving budget balance have both sides of the aisle ignoring the most important question: What policy changes would achieve a sustained period of 4% growth?

FORBES: The Budget Stalemate Shows The Need For Monetary Reform