Voter turnout and abstention pricing: quasi-experimental evidence on the effects of a marginal increase in the monetary enforcement of compulsory voting

In political science literature, it is often argued that compulsory voting can serve as a remedy against turnout inequality and thereby contribute to more egalitarian societies. However, the literature neglects differences between compulsory voting systems, and most studies consider the obligation to vote as a dichotomous variable. As a result, relatively little is known about the causal effects of particular stimuli and features of compulsory voting. By exploiting quasi-experimental conditions from direct-democratic decision-making in Switzerland, this research assesses the degree to which abstention fines account for a citizen’s willingness to vote under a compulsory voting context. The findings reveal that a marginal increase in monetary sanctions for voter-abstention leads temporally to a sizeable increase in turnout. However, it does not necessarily contribute to the expression of preferences by those traditionally underrepresented in direct-democratic decision-making since a third of those motivated to vote by the threat of a heavier fine will cast an empty or invalid ballot. The effect on turnout is further found to be moderated by income.