This volume contains the results of the International Conference on "Man- aging Enterprises ofthe New Economy by Modem Concepts ofthe Theory ofthe Firm", which took place in Hagen from 12-14 December 2002. The conference was organised jointly by the FernUniversit t in Hagen and the Erich-Gutenberg-Arbeitsgemeinschaft in Cologne. The Deutsche For- schungsgemeinschaft, the FernUniversit t and the M rkische Bank in Hagen provided generous financial support...