Fig. 2.

Party polarization and willingness to commit to international agreements at the Nash equilibrium as a function of the electoral cost of distance from stakeholders. The Left two panels report results for a uniform distribution of stakeholders in opinion space and for two levels of the electoral cost of party similarity, $c=0.1,c=0.5$. The Right two panels report results for a bimodal distribution and for the same levels of $c$. In all cases, $a=10,b_1=1,b_2=0.75$.