[求助]一道选择题（已解决，谢谢merm同学）

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<p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none;"><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T11","sans-serif"; mso-bidi-font-family: T11; mso-font-kerning: 0pt;">8.4 </span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T10","sans-serif"; mso-bidi-font-family: T10; mso-font-kerning: 0pt;">Ernest's income elasticity of demand for natural gas is 0.4. His price elasticity of demand for</span><span style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-family: T10; mso-font-kerning: 0pt; mso-ascii-font-family: T10; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: T10;">　</span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T10","sans-serif"; mso-bidi-font-family: T10; mso-font-kerning: 0pt;">natural gas is -</span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "Arial","sans-serif"; mso-font-kerning: 0pt;">0.</span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T5","sans-serif"; mso-bidi-font-family: T5; mso-font-kerning: 0pt;">3</span><span style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-family: T9; mso-font-kerning: 0pt; mso-ascii-font-family: T9; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: T9;">，</span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T10","sans-serif"; mso-bidi-font-family: T10; mso-font-kerning: 0pt;">and he spends 10% of his income on natural gas. What is his substitution price</span><span style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-family: T10; mso-font-kerning: 0pt; mso-ascii-font-family: T10; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: T10;">　</span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T10","sans-serif"; mso-bidi-font-family: T10; mso-font-kerning: 0pt;">elasticity?<p></p></span></p><p></p><p></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none;"><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T6","sans-serif"; mso-bidi-font-family: T6; mso-font-kerning: 0pt;">(a) </span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "Arial","sans-serif"; mso-font-kerning: 0pt;">-0.</span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T5","sans-serif"; mso-bidi-font-family: T5; mso-font-kerning: 0pt;">26<p></p></span></p><p></p><p></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none;"><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T6","sans-serif"; mso-bidi-font-family: T6; mso-font-kerning: 0pt;">(b) </span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "Arial","sans-serif"; mso-font-kerning: 0pt;">-0.</span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T5","sans-serif"; mso-bidi-font-family: T5; mso-font-kerning: 0pt;">34<p></p></span></p><p></p><p></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none;"><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T6","sans-serif"; mso-bidi-font-family: T6; mso-font-kerning: 0pt;">(c) </span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T5","sans-serif"; mso-bidi-font-family: T5; mso-font-kerning: 0pt;">.20<p></p></span></p><p></p><p></p><p class="MsoNormal" align="left" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-layout-grid-align: none;"><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T6","sans-serif"; mso-bidi-font-family: T6; mso-font-kerning: 0pt;">(d) </span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "Arial","sans-serif"; mso-font-kerning: 0pt;">-0.</span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T5","sans-serif"; mso-bidi-font-family: T5; mso-font-kerning: 0pt;">12<p></p></span></p><p></p><p></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T6","sans-serif"; mso-bidi-font-family: T6; mso-font-kerning: 0pt;">(e) </span><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T5","sans-serif"; mso-bidi-font-family: T5; mso-font-kerning: 0pt;">None of the above.</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T5","sans-serif"; mso-bidi-font-family: T5; mso-font-kerning: 0pt;"></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: "T5","sans-serif"; mso-bidi-font-family: T5; mso-font-kerning: 0pt;">答案上选A。请教这道题的思路。谢谢。</span></p>

[此贴子已经被作者于2007-12-19 19:48:41编辑过]

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关键词：merm 选择题 ERM 已解决 substitution natural 选择题 demand income price

自己顶一下。

Using Slutsky's Equation 

Price elasticity of  demand=substitution price elasticity - income elasticity of demand * demand

-0.3 = x - 0.4 * 10%

x = -0.26

以下是引用merm在2007-12-18 19:59:00的发言：

Using Slutsky's Equation 

Price elasticity of  demand=substitution price elasticity - income elasticity of demand * demand

-0.3 = x - 0.4 * 10%

x = -0.26

十分感谢。我从来都没意识到slutsky's equation还有这个意思....

不是特别懂那个substitution price elasticity

而且，为什么需求是10%啊？还是应该M/P*10%吗？（M是收入，P是天然气的价格——这样一来倒是没法算出数来....)

[此贴子已经被作者于2007-12-19 20:04:34编辑过]