The introduction of public goods into economic theory has recently
received substantial attention from economists. Both the increasing
significance of public goods and the deficiencies of the private
goods-oriented allocation mechanisms call for a re- orientation of the
classical general equilibrium models such as the one designed by Walras
exactly a century ago. Although several approaches to this problem are
possible, the duality approach seems to be very fruitful. In this study,
Dr. Ruys applies and develops the mathematical theory of polarity to
gain a deeper insight into the economic theory of value. He not only
uses the duality approach to simplify formal proofs related to public
goods, but he also gives an interpretation to the application of
polarity operations which goes far, beyond its formal significance. This
study is in a way closely related to the publication 'Axiomatic choice
models' by Dr. H. N. Weddepohl, which is volume 3 of the Tilburg Studies
on Economics.