Hurwicz received six honorary doctorates , from Northwestern University ( 1980 ) , the University of Chicago ( 1993 ) , Universitat Autònoma de Barcelona ( 1989 ) , Keio University ( 1993 ) , Warsaw School of Economics ( 1994 ) and Universität Bielefeld ( 2004 ) .
Hurwicz has received six honorary doctorates ( PhD ) , from Northwestern University ( 1980 ) , the University of Chicago ( 1993 ) , Universitat Autònoma de Barcelona ( 1989 ) , Keio University ( 1993 ) , Warsaw School of Economics ( 1994 ) and Universität Bielefeld ( 2004 ) .