On the Buyability of Voting Bodies

2007 This Working Paper should not be reported as representing the views of the IMF. The views expressed in this Working Paper are those of the author(s) and do not necessarily represent those of the IMF or IMF policy. Working Papers describe research in progress by the author(s) and are published to elicit comments and to further debate. We study vote buying by competing interest groups in a variety of electoral and contractual settings. While increasing the size of a voting body reduces its buyability in the absence of competition, we show that larger voting bodies may be more buyable than smaller voting bodies when interest groups compete. In contrast, imposing the secret ballot---which we model as forcing interest groups to contract on outcomes rather than votes---is an effective way to fight vote buying in the presence of competition, but much less so in its absence. We also study more sophisticated vote buying contracts. We show that, regardless of competition, the option to contract on both votes and outcomes is worthless, as it does not affect buyability as compared to contracting only on votes. In contrast, when interest group