日本経済学会 - Japanese Economic Association
The JEA-Nakahara Prize was established in 1995 and is founded by a donation from Mr. Nobuyuki Nakahara. The prize was established to honour researchers in economics under the age of 45 who have produced internationally recognized research.
It is my great pleasure to announce that the 2008 JEA-Nakahara Prize has been awarded to Professor Atsushi Kajii of Kyoto University. Born in 1963, Professor Kajii received a BA in Economics from Hitotsubashi University and a PhD in Economics from Harvard University. He previously taught at the University of Pennsylvania, the University of Tsukuba and Osaka University. Since 2003, he has been a professor at the Institute of Economic Research of Kyoto University.
Professor Kajii has made a wide range of significant contributions to economic theory. His important achievements can be best categorized into three groups. First, in general equilibrium theory with incomplete asset markets, he established a general welfare result with Alessandro Citanna and Antonio Villanacci (Citanna et al., 1998). In addition, with Piero Gottardi, he established a general result on the existence of sunspot equilibria (Gottardi and Kajii, 1999) and is currently working, among other things, on the welfare analysis of sunspot equilibria (Kajii, 2007, 2008). Second, in decision theory under uncertainty, he explored the implications of non-expected utility functions in both temporal and atemporal frameworks in a series of papers with Simon Grant and Ben Polak (Grant et al., 2000). Third, in game theory, he introduced, with Stephen Morris, a robustness concept for equilibria in games with complete information by formulating "smallness" of incomplete information structures (Kajii and Morris, 1997). More recently, with Takashi Ui, he extended the standard analysis on incomplete information games to the case where the players have not a single, but multiple prior beliefs on the states of nature (Kajii and Ui, 2005).
In summary, Professor Kajii's research investigates theoretically the effects of information on market systems and contributes significantly to deepen our understanding on important issues such as general equilibrium, incomplete markets, uncertainty and strategic behaviour in the contemporary economy.