Who Counts? Non-Citizen Residents, Spatial Sorting, and Malapportionment

Existing research argues that malapportionment primarily favours rural areas, resulting in conservative biases of electoral systems. In this paper, we provide a new perspective on the study of apportionment processes by identifying the institutional design under which malapportionment may favour other regions. Because of the geographical sorting of non-citizen residents, we argue that regions with high shares of non-citizen residents benefit from population-based apportionment, whereas the spatial sorting of non-citizens does not affect malapportionment in the case of citizen-based apportionment. Empirically, we use sub-national data from ten advanced democracies to forward evidence that differences in apportionment mechanisms and district-level shares of non-citizen residents systematically influence malapportionment. Our findings suggest that the impact of malapportionment on political representation and public policies may be more heterogeneous than previously thought.