For several decades, scholars have developed methods for solving optimization problems which emerge in economics, econometrics, operations research, and other disciplines. A considerable effort has been made to construct equations from which constraints can be derived, but surprisingly little...

I Opening Speech -- Opening Remarks: A Retrospection over 35 Years of Work -- II Keynote Addresses -- Decision Models and Preferences: The Pioneering Contributions of Ragnar Frisch -- Experiments with Preference Functions -- III Representation of Preferences by Objective Functions -- On the...

Reducing disparities among regions within European countries is the aim of European and national structural policies. In particular, a European grant contributes to the German governmental program for equalizing regional unemployment. The goal is to bring it down to the national average by...