Public Choice

, Volume 129, Issue 1–2, pp 169–187 | Cite as

A computational electoral competition model with social clustering and endogenous interest groups as information brokers

  • Vjollca Sadiraj
  • Jan Tuinstra
  • Frans van Winden
Original Article


We extend the basic model of spatial competition in two directions. First, political parties and voters do not have complete information but behave adaptively. Political parties use polls to search for policy platforms that maximize the probability of winning an election and the voting decision of voters is influenced by social interaction. Second, we allow for the emergence of interest groups. These interest groups transmit information about voter preferences to the political parties, and they coordinate voting behavior. We use simulation methods to investigate the convergence properties of this model. We find that the introduction of social dynamics and interest groups increases the separation between parties platforms, prohibits convergence to the center of the distribution of voter preferences, and increases the size of the winning set.


Interest Group Public Choice Political Party Ideal Point Policy Position 
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Copyright information

© Springer Science+Business Media, B.V. 2006

Authors and Affiliations

  • Vjollca Sadiraj
    • 1
  • Jan Tuinstra
    • 2
  • Frans van Winden
    • 3
  1. 1.University of ArizonaTucsonUSA
  2. 2.CeNDEF and Department of Quantitative EconomicsUniversity of AmsterdamAmsterdamthe Netherlands
  3. 3.CREED and Department of EconomicsUniversity of AmsterdamAmsterdamThe Netherlands

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