This book presents the results of a research project which has been carried out in the Special Research Unit (Sonderforschungs- bereich) 21 at Bonn University. It is a part of the current research on disaggregated econometric forecasting models with a fully integrated input-output system with variable input co- efficients where prices are explained as dual variables of the underlying production model. A similar approach has already been used by Knut KUbler "Ein disaggregiertes Prognosesystem fUr die Bundesrepublik, die Unternehmenssektoren", Meisenheim am Glan, 1977. But KUbler assumed...