Zipper system

The zipper system, also known as "vertical parity" or the "zebra system", is a type of gender quota for party lists in proportional representation electoral systems. It requires that parties alternate between women and men on their candidate lists, meaning that 50% of the candidates are women and 50% are men. The zipper method is applied to election laws in many countries in order to achieve equal gender representation in candidates and, potentially, elected members.

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