[求助] 经济学原理请高手帮偶看下这题~Budget Lines and Indifference Curves

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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><b><i><span lang="EN-NZ" style="FONT-SIZE: 16pt; mso-bidi-font-size: 10.0pt;"><font face="宋体, MS Song">经济学原理~请高手帮偶看下这题~谢谢</font></span></i></b></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><b><i><span lang="EN-NZ" style="FONT-SIZE: 16pt; mso-bidi-font-size: 10.0pt;"><font face="宋体, MS Song">QUESTION<span style="mso-spacerun: yes;">   </span>Budget Lines and Indifference Curves<p></p></font></span></i></b></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 13cm; TEXT-INDENT: -13cm;"><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: "Times New Roman";"><p> </p></span></p><p class="MsoBodyText" style="TEXT-JUSTIFY: inter-ideograph; MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify;"><span lang="EN-GB" style="FONT-SIZE: 10pt;"><font face="Times New Roman">Serena goes shopping at the local dairy, which you own. She has a fixed budget ($M) and has tentatively decided to spend it on 10 donuts and 5 cokes. The price of a coke is twice the price of a donut. Pondering her decision to buy this amount of donuts and coke, Serena says: “At this consumption point, I would be willing to give up 3 donuts to get one more coke.” Assume that Serena has standard (smooth, convex) indifference curves.<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: "Times New Roman";"><p> </p></span></p><p><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: Century; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: "MS Mincho"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;"><font face="宋体, MS Song">(a)<span style="mso-tab-count: 1;">     </span>Does her tentative choice (10 donuts and 5 cokes) maximise her utility subject to her budget constraint? If not, should she buy more cokes or more donuts? (Explain this using a diagram. Put cokes on the <i style="mso-bidi-font-style: normal;">x</i>-axis and donuts on the <i style="mso-bidi-font-style: normal;">y</i>-axis. Note that depending on how you have drawn Serena’s indifference curves, your final equilibrium consumption point may differ from other students.)<span style="mso-tab-count: 1;">     </span></font></span></p><p><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: Century; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: "MS Mincho"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;"><font face="宋体, MS Song"><span style="mso-tab-count: 1;"><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: "Times New Roman"; mso-fareast-font-family: "MS Mincho"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;">(b) Consider the equilibrium point Serena arrived at in 2(a). She places her equilibrium bundle of coke and donuts on the counter. As she is about to pay for them, you remember that you’ve got a stock of unsold cokes in the store room. You offer Serena a 50 percent discount on cokes on the condition that the discount applies only to additional purchases (ie, purchases of coke in excess of what she has on the counter already). Is Serena likely to buy more cokes (and give up some donuts)? Explain fully.<span style="mso-tab-count: 1;">   </span></span></span></font></span></p><p><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: Century; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: "MS Mincho"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;"><span style="mso-tab-count: 1;"><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: "Times New Roman"; mso-fareast-font-family: "MS Mincho"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;"><span style="mso-tab-count: 1;"><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: Century; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: "MS Mincho"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;"><font face="宋体, MS Song">(c)<span style="mso-tab-count: 1;">     </span>If Serena thought that donuts and cokes were perfect complements, would she be likely to buy more cokes? Explain fully. (Forget the assumption of standard indifference curves.)</font></span></span></span></span></span></p><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: Century; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: "MS Mincho"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;"><span style="mso-tab-count: 1;"><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: "Times New Roman"; mso-fareast-font-family: "MS Mincho"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;"><span style="mso-tab-count: 1;"><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: Century; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: "MS Mincho"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;"><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 27pt; TEXT-INDENT: -27pt;"><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: "Times New Roman";">(d)<span style="mso-tab-count: 1;">       </span>A person can consume coffee at home, or they can go to starbucks.<span style="mso-spacerun: yes;">  </span>At home, coffee costs RMB3.00 per serving and at starbucks it is RMB15.00 per serving for the same type.<span style="mso-spacerun: yes;">  </span>Suppose that this person has a fixed income of RMB300 per week to spend on coffee per month.<span style="mso-spacerun: yes;">  </span>Plot out the budget line and label a point at which he or she is most happy at.<span style="mso-spacerun: yes;">  </span><p></p></span></p><p><span lang="EN-NZ" style="FONT-SIZE: 10pt; FONT-FAMILY: Century; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: "MS Mincho"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-NZ; mso-fareast-language: JA; mso-bidi-language: AR-SA;"><font face="宋体, MS Song">Suppose now that the price of starbucks coffee decreases to RMB10.00 per unit.<span style="mso-spacerun: yes;">  </span>Assuming that both types of coffee are normal goods, plot out where this person may now consume and identify the income and substitution effects in this diagram.</font></span></p></span></span></span></span></span>

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关键词：Indifference difference Curves Budget DIFFER