The impact of candidate selection rules and electoral vulnerability on legislative behaviour in comparative perspective

Legislators are political actors whose main goal is to get re-elected. They use their legislative repertoire to help them cater to the interests of their principals. It is argued in this article that we need to move beyond treating electoral systems as monolithic entities, as if all legislators operating under the same set of macro-rules shared the same set of incentives. Rather, we need to account for within-system variation – namely, candidate selection rules and individual electoral vulnerability. Using a most different systems design, Germany, Ireland and Portugal are leveraged with both cross-system and within-system variation. An original dataset of 345,000 parliamentary questions is used. Findings show that candidate selection rules blur canonical electoral system boundaries. Electoral vulnerability has a similar effect in closed-list and mixed systems, but not in preferential voting settings.