北大中级微观经济学课件ch

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1、ChapterSevenRevealedPreference显示偏好RevealedPreferenceAnalysisSupposeweobservethedemands(consumptionchoices)thataconsumermakesfordifferentbudgets.Thisrevealsinformationabouttheconsumer’spreferences.Wecanusethisinformationto...RevealedPreferenceAnalysisTestthebehavioralhypothesist

2、hataconsumerchoosesthemostpreferredbundlefromthoseavailable.Discovertheconsumer’spreferencerelation.AssumptionsonPreferencesPreferencesdonotchangewhilethechoicedataaregathered.arestrictlyconvex.aremonotonic.Together,convexityandmonotonicityimplythatthemostpreferredaffordablebun

3、dleisunique.AssumptionsonPreferencesx2x1x1*x2*Ifpreferencesareconvexandmonotonic(i.e.well-behaved)thenthemostpreferredaffordablebundleisunique.DirectPreferenceRevelationSupposethatthebundlex*ischosenwhenthebundleyisaffordable.Thenx*isdirectlyrevealedpreferredtoy(otherwiseywo

4、uldhavebeenchosen).x*直接显示偏好于yDirectPreferenceRevelationx2x1x*yThechosenbundlex*isdirectlyrevealedpreferredtothebundlesyandz.zDirectPreferenceRevelationThatxisdirectlyrevealedpreferredtoywillbewrittenasxy.DpIndirectPreferenceRevelationSupposexisrevealeddirectlypreferredtoy,and

5、yisrevealeddirectlypreferredtoz.Then,bytransitivity,xisindirectlyrevealedpreferredtoz.Writethisasxzsoxyandyzxz.DpDpIpIpIndirectPreferenceRevelationx2x1x*zzisnotaffordablewhenx*ischosen.IndirectPreferenceRevelationx2x1x*y*zx*isnotaffordablewheny*ischosen.IndirectPreferenceRev

6、elationx2x1x*y*zzisnotaffordablewhenx*ischosen.x*isnotaffordablewheny*ischosen.zisnotaffordablewhenx*ischosen.x*isnotaffordablewheny*ischosen.Sox*andzcannotbecompareddirectly.IndirectPreferenceRevelationx2x1x*y*zButx*x*y*zisnotaffordablewhenx*ischosen.x*isnotaffordablewheny*i

7、schosen.Sox*andzcannotbecompareddirectly.IndirectPreferenceRevelationx2x1x*y*zDpButx*x*y*andy*zzisnotaffordablewhenx*ischosen.x*isnotaffordablewheny*ischosen.Sox*andzcannotbecompareddirectly.IndirectPreferenceRevelationx2x1x*y*zDpDpzisnotaffordablewhenx*ischosen.x*isnotaffo

8、rdablewheny*ischosen.Sox*andzcannotbecompareddirectl