Valence, complementarities, and political polarization

I study a model of electoral competition where two parties that care about both the spoils office and policy compete by announcing platforms. Parties are characterized their valence on one hand platforms other. Unlike in extant literature, assume complements (instead substitutes) from voter's perspective. generally characterize equilibrium show such framework increasing or parties' level(s) leads to moderation. To contrary, if have minimal maximally polarized. The hence uncovers as an important determinant political polarization.