5 - A Causal Connection?

Summary

Chapter 5 builds on the observational findings from the previous chapter to test the hypotheses using two survey experiments performed on a sample of British Labour voters. The first experiment manipulates the selective incentives available to members by changing the cost of joining. Not surprisingly, people are more interested in joining when fees are low. The second experiment manipulates the party’s instrumental incentives by stating members can (or cannot) select party leaders and parliamentary candidates, as well as attend events where they may formally participate in determining the party’s future policy direction. The findings support the hypotheses generated by Chapter 2’s formal model: decentralization increases membership, conditional on voter-party alignment.