TY - JOUR A1 - Reuben, Ernesto A1 - Traxler, Christian A1 - van Winden, Frans T1 - Advocacy and political convergence under preference uncertainty JF - European Economic Review N2 - We study the formation of advocacy groups and how they can impact policy outcomes by revealing information about voters׳ preferences to uninformed political candidates. We conduct a laboratory experiment based on a two-candidate spatial electoral competition setting where the policy preferences of voters are (initially) unknown and change over time. In the control treatment candidates learn about the preferred policy of the median voter through the voting outcome of elections. In the advocacy treatments, voters can organize themselves into advocacy groups in order to reveal their policy preferences. We find that voters often overcome the collective action problem of forming an advocacy group. In fact, we observe the formation of both informative advocacy groups, which convey new information, and uninformative advocacy groups, which do not. Overall, advocacy groups significantly speed up the convergence to the preferred policy of the median voter. However, advocacy does not lead to higher earnings as the gains from faster convergence are offset by the costs of group formation. KW - Advocacy groups KW - Information transmission KW - Political convergence KW - Voting KW - Median voter Y1 - 2015 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b1570-opus4-19681 N1 - This is a post-peer-review, pre-copyedit version of an article published in European Economic Review. The final authenticated version is available online at: DOI 10.1016/j.euroecorev.2015.07.003 VL - 78 SP - 16 EP - 36 ER -