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2023-03-12 11:19Module 1-書（2022-L1V1）P22-Example 2-（1）Solution to 1,為什么要考慮For her birthday, a friend gave her a one-month club membership as a gift, and that month she saw 12 movies？為什么要拿這個(gè)條件下的12 movies與正常預(yù)算情況下可購買6 movies相比較？題干中說的是，In months that she does join the club, she sees eight movies. 而不是For her birthday, a friend gave her a one-month club membership as a gift, and that month she saw 12 movies. （2）Solution to 2，不太能理解，為什么the income effect of the price decrease has been removed by charging her the monthly fee?以及怎么結(jié)合后一句話一起理解？So the increase from six movies to eight is the result of the substitution effect.（3）Solution to 3, 因?yàn)閙ovies不是必需品essentials, 所以判斷movies are not a Giffen good ? 另外，不太能理解Solution to 3的最后一句話，The substitution effect caused her to buy two more movies, and the income effect caused her to buy an additional four movies.請(qǐng)解析
所屬：CFA Level I > Economics 視頻位置 相關(guān)試題
來源： 視頻位置 相關(guān)試題
1個(gè)回答
roushan助教
2023-03-13 20:20
該回答已被題主采納
（1）“Solution to 1,為什么要考慮For her birthday, a friend gave her a one-month club membership as a gift, and that month she saw 12 movies？為什么要拿這個(gè)條件下的12 movies與正常預(yù)算情況下可購買6 movies相比較？題干中說的是，In months that she does join the club, she sees eight movies. 而不是For her birthday, a friend gave her a one-month club membership as a gift, and that month she saw 12 movies. ”
因?yàn)轭}目1問的是，在沒有會(huì)員制這一說法的前提下，電影價(jià)格只是單純從8元降到4元的情況，也就是說M同學(xué)不需要支付額外會(huì)員費(fèi)情況下的需求變動(dòng)，題目中朋友送M會(huì)員后，M的需求變化符合沒有會(huì)員情況的要求，所以應(yīng)該和這個(gè)條件對(duì)比。
（2）Solution to 2，不太能理解，為什么the income effect of the price decrease has been removed by charging her the monthly fee?以及怎么結(jié)合后一句話一起理解？So the increase from six movies to eight is the result of the substitution effect.
收入效應(yīng)是指價(jià)格下降，相同收入的情況下，實(shí)際購買力是增加的，進(jìn)而導(dǎo)致商品的需求上升。題目中說在有會(huì)員費(fèi)存在的情況下價(jià)格半價(jià)和原價(jià)價(jià)格情況下M同學(xué)的對(duì)其的滿足度是相同的（Monica is exactly indifferent between (a) not buying the membership and, therefore, paying $8 for movies and (b) buying the membership and paying $4 per movie）言外之意就是，在有會(huì)員費(fèi)的情況下，價(jià)格的下降，并沒有使M同學(xué)的實(shí)際購買力增加，也就是說收入效應(yīng)=0，因此從6到8增加是替代效應(yīng)。
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追答
3）”Solution to 3, 因?yàn)閙ovies不是必需品essentials, 所以判斷movies are not a Giffen good ? 另外，不太能理解Solution to 3的最后一句話，The substitution effect caused her to buy two more movies, and the income effect caused her to buy an additional four movies.“
本題不是通過常識(shí)判斷電影的性質(zhì)，而是通過替代效果和收入效果來判斷，電影對(duì)于M來說，價(jià)格下降，替代效應(yīng)和收入效應(yīng)都為負(fù)（也就是需求和價(jià)格反向關(guān)系），所以是正常商品。對(duì)于吉芬商品來說，價(jià)格下降，由于替代效應(yīng)需求上升，收入效應(yīng)下需求下降，且收入效應(yīng)下需求下降的幅度大于替代效應(yīng)的增加量，所以總效應(yīng)為負(fù)換言之就是價(jià)格下降，需求下降。
最后一句話：價(jià)格下降，M對(duì)電影的總需求從6場(chǎng)上升到12場(chǎng)，增加的6個(gè)場(chǎng)次中，其中兩場(chǎng)是由替代效應(yīng)產(chǎn)生的，另外四場(chǎng)是由收入效應(yīng)產(chǎn)生的。
附：收入效應(yīng)和替代效應(yīng)的總截圖 -
追問
Solution to 2答復(fù)中所說的：和原價(jià)價(jià)格情況下M同學(xué)的對(duì)其的滿足度是相同的----->這句話什么意思？
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追答
言外之意就是，在有會(huì)員費(fèi)的情況下，價(jià)格的下降，M的實(shí)際購買力和下降之前的購買力是一樣的，所以說滿足度相同。
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