Contact information
Department of Economics, Turku School of Economics, FIN-20500
Turku. E-mail: hannu.vartiainen (at) tse.fi.
Acknowledgements
I thank Seppo Honkapohja, Philippe Jehiel, Klaus Kultti, Bart
Lipman, Rafael Repullo, Hamid Sabourian, Hannu Salonen, Juuso
Valimaki, and Asher Wolinsky for useful discussions and good
comments. Financial support from the Academy of Finland is
gratefully acknowledged.