We present a model where a society elects a parliament by voting for candidates belonging to
two parties. The electoral rule determines the seats distribution between the two parties. We
analyze two electoral rules, multidistrict majority and single-district proportional. In this
framework, the policy outcome is simply a function of the number of seats parties take in the
election. We prove that in both systems there is a unique pure strategy perfect equilibrium
outcome. Finally, we compare the outcomes in the two systems
