Plurality versus proportional electoral rule: study of voters' representativeness

Thinking of electoral rules, common wisdom suggests that proportional rule is more fair, since all voters are equally represented: at times, it turns out that this is false. I study the formation of both Parliament and Government; for the composition of the former I consider plurality and proportional rule; for the formation of the latter, I assume that parties play a non-cooperative game à la Rubinstein. I show that, unless parties are impatient to form a Government, proportional electoral rules translate into a more distortive distribution of power among parties than plurality rule; this happens because of the bargaining power of small parties during Government formation.electoral systems, proportional rule, plurality rule, voters¿ representation.

07271 Abstracts Collection -- Computational Social Systems and the Internet

From 01.07. to 06.07.2007, the Dagstuhl Seminar 07271 ``Computational Social Systems and the Internet\u27\u27 was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available

Laboratory Experiments in Political Economy

Most of the laboratory research in political science follows the style that was pioneered in experimental economics a half-century ago by Vernon Smith. The connection between this style of political science experimentation and economics experimentation parallels the connection between economic theory and formal political theory.

Committee preferences and information acquisition

We study committees whose task is to make a binary decision where the correct decision depends on the state of the world that is imperfectly known. Committee members can exert effort to learn about the true state of the world and their efforts are linked in a team production function. This allows to explore the externalities between the committee members’ efforts in the search for the truth and the different interactions between them. We compare committees made up of neutral members (neutral committees) to committees including biased members (polarized committees). We show that polarized committees may be more efficient than neutral committees when members’ efforts to acquire information are strategic substitutes, but not when efforts are strategic complements. Qualitatively, our results still hold when biased members have mixed preferences i.e., they have a bias for one decision outcome but also care about matching the decision to the true state of the world. Our results have implications for instance for the rules governing committees in international arbitration and allow us to better understand how the committee composition affects the committee’s efficiency