微觀經(jīng)濟(jì)理論3elasticitytheory(完整版)
【正文】 入解中， Pt=（ P0 – Pe ） (d/b)t+ Pe 41 蛛網(wǎng)模型（數(shù)學(xué)方法） 通過上式子，可以看出： db時，震蕩將為放大震蕩 d=b時，震蕩為單位震蕩 db時，震蕩為衰減震蕩 Qdt=abPt Pt =a/b (1/ b) Qdt(a,b0) Qst=c+dPt1 Pt1 =c/d+(1/d) Qst (c,d0) 42 收斂型蛛網(wǎng)（圖示） o Q P E D S P* Q* P0 Q1 P1 Q2 P2 Q3 P3 Q4 43 發(fā)散型蛛網(wǎng)（圖示） o Q P E D S P* Q* P0 Q1 P1 Q2 P2 Q3 P3 Q4 44 穩(wěn)定型蛛網(wǎng)（圖示） o Q P D S E P* Q* P0 Q1 P1 Q2 P2 Q3 P3 Q4 45 三類蛛網(wǎng)模型的條件 ?收斂型蛛網(wǎng)的條件： 供給彈性 需求彈性，或，供給曲線斜率 需求曲線斜率（絕對值）。 16 彈性與斜率 elasticity and slope ?對應(yīng)于同一點，彈性與斜率的大小成反比(指絕對值 )。 ) e= （ Δ Y/Y） /（ Δ X/X） =（ ΔY/ ΔX） ?（ X/Y ） 彈性是一個具體的數(shù)值 coefficient，與變量之間的度量無關(guān)。 4 ? Elasticity is a measure of responsiveness. Two words are important here. The word measure means that elasticity results are reported as numbers, or elasticity coefficients. The word responsiveness means that there is a stimulusreaction involved. Some change or stimulus causes people to react by changing their behavior, and elasticity measures the extent to which people react. 5 2. Elasticity of Demand Qd=f( P, I, Pi,Pe… ) PPQdQdEd//???IIQdQdE I//???PiPiQdQdExy //???6 Price elasticity of demand ? The most mon elasticity measurement is that of price elasticity of demand. It measures how much consumers respond in their buying decisions to a change in price. 7 ? The basic formula used to determine price elasticity is: p r i cei n ch an g e p er cen t ag eq u an t i t yi n ch an g e p er cen t ag e?EPPQdQdEd//???8 . If price increases by 10% and consumers respond by dec
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