This book has been used as a text in the Departments of Econo- mics at the University of Heidelberg (FRG) during the last decade and the University of Bern (Switzerland) during the last seven years. We therefore were glad when Dr. Muller of Springer-Verlag offered to publish a soft cover version of the second edition, to make the next economically more accessible to students. Heidelberg and Bern, January 1995 Malte Faber Horst Niemes Gunter Stephan...