Abstract: | Choosing the number of seats in a legislature is a balancing act between efficiency and representativeness. This article focuses on representativeness and hypothesises that the larger the assembly, the higher the vote–seat proportionality, the higher the number of parties represented, and the higher the representation of otherwise under-represented groups. An approach using simulations of elections is introduced and applied in testing the hypotheses in the case of Danish local elections. Two thousand six hundred and forty-six elections are simulated, and a positive, but non-linear, relationship is demonstrated between number of seats and proportionality, number of parties, and percentage of women councillors. |