<P style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-layout-grid-align: none" class=MsoNormal align=left><SPAN style="FONT-FAMILY: 'T10','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T10; mso-font-kerning: 0pt" lang=EN-US>Martha's utility function is </SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>U</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>(</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>x; y</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>) = </SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>min</SPAN><SPAN style="FONT-FAMILY: 'T7','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T7; mso-font-kerning: 0pt" lang=EN-US>(</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>x </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>+ 2</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>y; </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>x </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>+ </SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>y</SPAN><SPAN style="FONT-FAMILY: 'T7','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T7; mso-font-kerning: 0pt" lang=EN-US>).</SPAN><SPAN style="FONT-FAMILY: 'T10','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T10; mso-font-kerning: 0pt" lang=EN-US> George's utility function is</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>U</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>(</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>x; y</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>) = </SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>min</SPAN><SPAN style="FONT-FAMILY: 'T7','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T7; mso-font-kerning: 0pt" lang=EN-US>(</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>x </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>+ 4</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>y; </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>4</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>x </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>+ 2</SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>y</SPAN><SPAN style="FONT-FAMILY: 'T7','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T7; mso-font-kerning: 0pt" lang=EN-US>)</SPAN><SPAN style="FONT-FAMILY: 'T10','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T10; mso-font-kerning: 0pt" lang=EN-US>. If George and Martha have the same income and face the same prices for the goods </SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>x </SPAN><SPAN style="FONT-FAMILY: 'T10','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T10; mso-font-kerning: 0pt" lang=EN-US>and </SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>y </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>:</SPAN><SPAN style="FONT-FAMILY: 'T10','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T10; mso-font-kerning: 0pt" lang=EN-US>
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<P style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-layout-grid-align: none" class=MsoNormal align=left><SPAN style="FONT-FAMILY: 'T6','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T6; mso-font-kerning: 0pt" lang=EN-US>(a) </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>George and Martha will both demand the same amount of </SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>y</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>.
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<P style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-layout-grid-align: none" class=MsoNormal align=left><SPAN style="FONT-FAMILY: 'T6','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T6; mso-font-kerning: 0pt" lang=EN-US>(b) </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>Martha will always prefer George's consumption bundle to her own.
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<P style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-layout-grid-align: none" class=MsoNormal align=left><SPAN style="FONT-FAMILY: 'T6','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T6; mso-font-kerning: 0pt" lang=EN-US>(c) </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>George will always prefer Martha's consumption bundle to his own.
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<P style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-layout-grid-align: none" class=MsoNormal align=left><SPAN style="FONT-FAMILY: 'T6','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T6; mso-font-kerning: 0pt" lang=EN-US>(d) </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>George will demand more </SPAN><SPAN style="FONT-FAMILY: 'T9','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T9; mso-font-kerning: 0pt" lang=EN-US>x </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>than Martha demands.
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 'T6','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T6; mso-font-kerning: 0pt" lang=EN-US>(e) </SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>None of the above.
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt; mso-ascii-font-family: T5; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: T5">答案选</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt; mso-ascii-font-family: T5; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: T5">。为什么啊？如果</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>X</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt; mso-ascii-font-family: T5; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: T5">，</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>Y</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt; mso-ascii-font-family: T5; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: T5">的价格分别为</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>2,1,</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt; mso-ascii-font-family: T5; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: T5">则预算线和无差异曲线的一部分重合，这时两人对</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>Y</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt; mso-ascii-font-family: T5; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: T5">的需求就不一定相等啊</SPAN><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>…</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 'T5','sans-serif'; FONT-SIZE: 12pt; mso-bidi-font-family: T5; mso-font-kerning: 0pt" lang=EN-US>谢谢</SPAN><SPAN style="FONT-SIZE: 12pt" lang=EN-US>
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