IMPROVING SEATS APPORTIONEMENT IN INTERCOMMUNAL STRUCTURES: THE CASE OF THE VAL D'OISE REGION

The purpose of this paper is to analyze the apportionment of seats in intercommmunal structures in the Val-d'Oise region. We compare the observed distribution of the seats to a theoretical one obtained with the Webster's method (or Saint-Lague's method). This comparison is made using the most important power indices in the literature, the Shapley-Shubik index and the Banzhaf index. Assuming that the distance minimisation between populution and power is a good criteria, we show that the observed seats apportionements, the number of seats and the majority rule are not optimal.