Template-Type: ReDIF-Paper 1.0 Series: Tinbergen Institute Discussion Papers Creation-Date: 2005-04-06 Number: 05-034/1 Author-Name: Vjollca Sadiraj Author-Email: vsadiraj@econlab.arizona.edu Author-Workplace-Name: Economic Science Laboratory, University of Arizona, Tucson, USA Author-Name: Jan Tuinstra Author-Email: j.tuinstra@uva.nl Author-Workplace-Name: CeNDEF, Faculty of Economics and Econometrics, Universiteit van Amsterdam Author-Name: Frans van Winden Author-Email: f.a.a.m.vanwinden@uva.nl Author-Workplace-Name: CREED, Faculty of Economics and Econometrics, Universiteit van Amsterdam Title: On the Size of the Winning Set in the Presence of Interest Groups Abstract: Interest groups are introduced in a spatial model of electoral competition between two political parties. We show that the presence of these interest groups increases the winning set, which is the set of policy platforms for the challenger that will defeat the incumbent. Therefore interest groups enhance the probability of the challenger winning the election. Classification-JEL: D71; D72 Keywords: Spatial voting models; electoral competition; winning set; interest groups. File-Url: https://papers.tinbergen.nl/05034.pdf File-Format: application/pdf File-Size: 286493 bytes Handle: RePEc:tin:wpaper:20050034