Mathematics
Electoral Systems and Women's Legislative Representation
Quick fact
Globally, countries using proportional representation (PR) elect about 25% women to their national parliaments, while majoritarian systems average below 15%—a gap that persists even after controlling for economic development and culture.
Why this is interesting
Imagine two countries with similar cultures and histories—yet one elects twice as many women to parliament. Why? The answer lies in how votes are translated into seats.
Read the full explanation
Understanding Electoral Systems and Women's Legislative Representation
Electoral systems are the rules that convert votes into parliamentary seats. The two broad families are majoritarian (first-past-the-post, where the candidate with the most votes wins a single-member district) and proportional representation (where votes are distributed to parties in proportion to their overall share, usually using multi-member districts). Think of the difference like hiring for a team: in a single-member district, a party can field only one candidate, so it must choose the 'best' person—often an established incumbent, who is more likely male. In a multi-member district, the party can field a slate of candidates, and it has an incentive to balance the ticket to appeal to different voters. This is why women are more likely to be nominated and elected under PR systems.
A deeper explanation
The mechanism behind this electoral system effect operates through several channels. First, district magnitude—the number of representatives elected per district—plays a central role. Larger magnitude means parties win multiple seats per district, which encourages them to diversify their candidate lists to attract votes from different demographics, including women. Second, party leaders in PR systems face pressure to include women on their lists because a balanced list can signal inclusiveness and expand the party's appeal. In contrast, in single-member districts, party gatekeepers often fear that a 'risky' candidate (such as a woman) might lose the seat, leading them to stick with the safer, male incumbent. Third, PR systems are more compatible with gender quotas—either legislated or voluntary party quotas—because they allow parties to place women in winnable positions on the list. Quotas are much harder to implement in single-member districts. Finally, the electoral system shapes the broader political culture: PR systems tend to be more multiparty and coalition-based, which can create more opportunities for women to enter politics through smaller parties. This mechanism explains why the difference in women's representation is so consistent across countries.