In their 2014 article in the British Journal of Political Science, Eleanor Neff Powell and Joshua A. Tucker examine the determinants of party system volatility in post-communist Europe. Their central conclusion is that replacement volatility – volatility caused by new party entry and old party...

Much of the literature on legislative party cohesion argues that parties are essential exist in order to help individual legislators achieve their preferred policies. In addition, parties can offer legislators unique electoral resources that help them overcome election challenges. Yet, in...