弹性及其应用 弹性 Elasticity Elasticity and Its ◆…是买者和卖者对市场环境变化作出反应的 Application 程度大小的一种度量方法 is a measure of how much buvers and sellers respond to changes in market conditions 第5章 Chapter 5 ◆…使我们能够更精确地分析供给和需求 llows us to analyze supply and demand with greater precision 需求的价格弹性 需求价格弹性的决定因素 Determinants of Price Elasticity of Demand Price Elasticity of Demand 给定百分之一的价格变化,需求量变化的百分 ◆必品还是膏修品 Necessities versus luxuries Price elasticity of demand is the percentage change in quantity demanded given a percent ◆相近普代品的可获得性 change in the price Availability of Close Substitut 杨扬的界定 ◆它衡量了一种物品的需求量对该物品价格变化 Definition ofthe Mark 出反应的程度大小 时闻范 It is a measure of how much the quantity Time Horizon demanded of a good responds to a change in the price of that good. 需求价格弹性的决定因素 计算需求价格弹性 Determinants of Computing the Price Elasticity Price Elasticity of Demand of demand 那求倾向于更富有弹性 用需求量变动的百分数除以价格变动的百分数 Demand tends to be more elastic 就计算出了需求的价格弹性 ◆如果该商品是奢侈品 The price elasticity of demand is computed as the percentage change in the quantity demanded ◆时间间隔越长 divided by the percentage change in price. Pe巨分数ge ◆相近替代品的个数越多 Price Elasticity of Demand= Quantity Demanded the larger the number of close substitutes. 需求价格弹性 Percentage Change ◆市场界定得越狭隘 价格变化的百分数 the more narrowly defined the market.1 弹性及其应用 Elasticity and Its Application 第5章 Chapter 5 弹性 Elasticity . . . ‹ ……是买者和卖者对市场环境变化作出反应的 程度大小的一种度量方法 … is a measure of how much buyers and sellers respond to changes in market conditions ‹……使我们能够更精确地分析供给和需求 … allows us to analyze supply and demand with greater precision. 需求的价格弹性 Price Elasticity of Demand ‹ 给定百分之一的价格变化，需求量变化的百分 数就是需求的价格弹性。 Price elasticity of demand is the percentage change in quantity demanded given a percent change in the price. ‹ 它衡量了一种物品的需求量对该物品价格变化 作出反应的程度大小。 It is a measure of how much the quantity demanded of a good responds to a change in the price of that good. 需求价格弹性的决定因素 Determinants of Price Elasticity of Demand ‹ 必需品还是奢侈品 Necessities versus Luxuries ‹ 相近替代品的可获得性 Availability of Close Substitutes ‹ 市场的界定 Definition of the Market ‹ 时间范围 Time Horizon 需求价格弹性的决定因素 Determinants of Price Elasticity of Demand 需求倾向于更富有弹性： Demand tends to be more elastic : ‹ 如果该商品是奢侈品 if the good is a luxury. ‹ 时间间隔越长 the longer the time period. ‹ 相近替代品的个数越多 the larger the number of close substitutes. ‹ 市场界定得越狭隘 the more narrowly defined the market. 计算需求价格弹性 Computing the Price Elasticity of Demand 用需求量变动的百分数除以价格变动的百分数， 就计算出了需求的价格弹性 The price elasticity of demand is computed as the percentage change in the quantity demanded divided by the percentage change in price. 需求价格弹性 Price Elasticity of Demand = Percentage Change in Quantity Demanded Percentage Change in Price Price Elasticity of Demand = Percentage Change in Quantity Demanded Percentage Change in Price 需求量变化的百分数 价格变化的百分数