Ballot Complexity and the Paradox of Choice : A Worldwide Analysis of List PR Systems with Preference Voting (1994-2024)
This contribution investigates how ballot complexity shapes vote concentration in preferential list PR systems – a growing electoral system used in over 30 democracies. These systems impose a dual cognitive burden on voters: choosing a party list and then selecting candidates within that list. Drawing on original data covering 158 elections across 28 countries (1994–2024), we test the effects of three electoral parameters: the number of candidates (C), the number of preference votes allowed (PV), and the number of competing parties (N).