Party Competition and Cooperation Shape Affective Polarization: Evidence from Natural and Survey Experiments in Israel Lotem Bassan-Nygate † Chagai M. Weiss ‡ February 6, 2020 Word Count: 9,272 Abstract Does electoral competition increase affective polarization? Can cross-party cooperation depo- larize voters? Addressing these questions is challenging since both competition and cooper- ation are endogenous to political attitudes. Building on social identity theory, and leveraging a natural experiment unfolding over seven Israeli election studies, we demonstrate that en- hanced electoral competition, measured by interview date proximity to an election, increases affective partisan polarization. We then consider whether party cooperation can depolarize the electorate. To do so, we leveraged the ambiguity around coalition building in Israel’s 22nd election and implemented a survey experiment where we credibly shaped respondents’ per- ceptions regarding the likelihood that a unity government will form in the near future. We find that priming party cooperation in the form of a unity government, promotes more tolerance across partisan lines. Our study contributes to the affective polarization literature by causally identifying institutional causes and remedies of polarization in a comparative context. †UW – Madison, Q:
[email protected]. ‡UW – Madison, Q:
[email protected], : www.chagaimweiss.com. The survey experiment presented in this paper was pre-registered with EGAP (ID: 20191010AA). We are grateful for generous support from the Wisconsin Project on IR, and the Center for Jewish Studies at the University of Wisconsin Madison, as well as for logistical support provided by Cody Legreid for the implementation of Study II. We thank participants in the Comparative Politics Working Group at UW-Madison, as well as Rikhil Bhavnani, Barry Burden, Michael Freedmen, Noam Gidron, Michael Masterson, Ellie Powell, Jonathan Renshon, Nadav Shelef, Marcy Shieh, and Alex Tahk for helpful comments and suggestions.