Proportionality in electoral systems is often seen as the best means to produce statistically
representative government. In this paper, I argue that majority bonuses—whereby the party
that obtains a plurality of votes automatically obtains an absolute majority in the legislature—
can bolster the number of statistically atypical working-class candidates that manage to obtain
office in PR systems. The difference is mechanically driven, as workers are systematically
granted lower placements on party lists. Majority bonuses reduce the number of parties in the
legislature, by increasing the number of seats allocated to winning parties. Formula disproportionality
thus allows a larger number of workers with low list placements to enter politics. As
a test of theory, I present evidence from a natural experiment on a municipality-level change
in electoral formulas, which took place in Italy in 1993. Leveraging a difference-in-discontinuities
design, I find that the bonus improves working class representation in municipal councils.
Effects are driven by a positive change in the proportion of workers that enter councils via winning
party lists.