弧弹性的判定及推论  

The Judgement and Inferences of Arc Elasticity

作　　者：刘敬龙[1] 

机构地区：[1]济宁学院经济与管理系,山东曲阜273155

出　　处：《济宁学院学报》2016年第1期124-128,共5页Journal of Jining University

摘　　要：弧弹性是经济分析的一个常用工具,不少文献对弧弹性有一些模糊甚至是错误表达。弧弹性的几何意义是两点间弧弹性等于其线段中点的点弹性,并在此基础上给出需求弧弹性和供给弧弹性的简单判定,同时更正了若干理解性的错误:弧弹性的大小与该弧在曲线的位置有关;线性需求曲线的弧弹性与销售收入的关系比点弹性复杂,不可因为弧弹性大于1或小于1就片面决策,还要考虑弧的端点与线性曲线中点的位置关系。将弧弹性转化为点弹性,为判别供求曲线弧弹性提供了一种简便方法。The arc elasticity is a common tool for economic analysis. There are a lot of vague or even error descriptions on the arc elasticity in many literatures. The geometric significance is that the arc elasticity between two points equals the midpoint elasticity of the line. The size of arc elasticity relates the position of the arc on the curve. There are different methods of judging the size of supply and demand arc elasticity. The relationship between arc elasticity of linear demand curve and sales revenue is more complicated than midpoint elasticity. We cannot make one-sided decision because the arc elasticity is greater than 1 or less than 1, and we should consider the position relationship between arc end points and midpoint of linear curve. Turning arc elasticity to point elasticity provides an easy calculating method for judging the arc elasticity of supply and demand curve.

关 键 词：弧弹性 点弹性 中点公式 需求 供给 

分 类 号：F016[经济管理—政治经济学] F224