システム情報系 社会工学域                            

 

 

         平成24年度  ファカルティ・セミナー

                       (Faculty Seminar)

 

 

日 時 : 2012710()  11:1012:15

場 所 : 第三学群F棟 3F1102

講演者 : Yi-You Yang [ Aletheia University, Taiwan ]

司会者 : 石川 竜一郎

演 題 : Gross substitutability of preferences without monotonicity

 

 

 

                           abstract

 

 

In exchange economies with indivisible goods, gross substitutability and monotonicity are used as crucial conditions to guarantee the existence of Walrasian equilibrium. Gul and Stacchetti (1999, JET) show that, when preferences under consideration are assumed to be monotone, (i) single improvement (SI)property, as well as no complementarities(NC), is equivalent to (GS), and(ii)the set of GS preferences is the largest set containing unit demand preferences for which the existence of Walrasian equilibrium is guaranteed. In this paper, we study the importance of monotonicity, and show that, even in the absence of monotonicity, the foregoing results by Gul and Stacchetti still hold.