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A Bargaining Theory of Conflict with Evolutionary Preferences

  • Andrew T. Little and Thomas Zeitzoff

Bargaining models play a central role in international relations, particularly in the study of conflict. A common criticism of this approach is that it fails to account for nonmaterial (e.g., psychological) factors that may influence the bargaining process. We augment a standard bargaining model by allowing actors’ preferences over conflict to diverge from the “fitness” payoffs (e.g., resources) typical of such models. Preferences are subject to evolutionary forces—those who attain high fitness reproduce more. We find that (1) there is a trade-off where being “irrationally” tough leads to better bargains but also more inefficient conflict; (2) actors develop behavioral biases consistent with empirical findings from psychology and behavioral economics; and (3) these behavioral biases inevitably lead to conflict. By bridging the strategic and psychological approaches to conflict, our models provide new insights into questions such as how changes in military and intelligence-gathering technology affect the likelihood and expected cost of war, and how to interpret the purported decline of violence over recent human history.

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Acharya, Avidit, Blackwell, Matthew, and Sen, Maya. 2016a. Explaining Preferences from Behavior: A Cognitive Dissonance Approach. Manuscript, Stanford University.
Acharya, Avidit, Blackwell, Matthew, and Sen, Maya. 2016b. The Political Legacy of American Slavery. Journal of Politics 78 (3):621–41.
Acharya, Avidit, and Grillo, Edoardo. 2015. War with Crazy Types. Political Science Research and Methods 3 (2):281307.
Adler, Robert S., Rosen, Benson, and Silverstein, Elliot M.. 1998. Emotions in Negotiation: How to Manage Fear and Anger. Negotiation Journal 14 (2):161–79.
Arena, Philip, and Wolford, Scott. 2012. Arms, Intelligence, and War. International Studies Quarterly 56 (2):351–65.
Atran, Scott. 2006. The Moral Logic and Growth of Suicide Terrorism. Washington Quarterly 29 (2):127–47.
Axelrod, R., and Hamilton, William D. 1981. The Evolution of Cooperation. Science 211 (4489):1390–96.
Banks, Jeffrey S. 1990. Equilibrium Behavior in Crisis Bargaining Games. American Journal of Political Science 34 (3):599614.
Bar-Tal, Daniel. 2001. From Intractable Conflict Through Conflict Resolution to Reconciliation: Psychological Analysis. Political Psychology 21 (2):351–65.
Barkow, Jerome H., Cosmides, Leda, and Tooby, John. 1995. The Adapted Mind: Evolutionary Psychology and the Generation of Culture. Oxford, UK: Oxford University Press.
Bauer, Michal, Blattman, Christopher, Chytilová, Julie, Henrich, Joseph, Miguel, Edward, and Mitts, Tamar. 2016. Can War Foster Cooperation? Journal of Economic Perspectives 30 (3):249–74.
Bester, Helmut, and Güth, Werner. 1998. Is Altruism Evolutionarily Stable? Journal of Economic Behavior and Organization 34 (2):193209.
Boehmer, Charles, Gartzke, Erik, and Nordstrom, Timothy. 2004. Do Intergovernmental Organizations Promote Peace? World Politics 57 (1):138.
Bowles, Samuel. 1998. Endogenous Preferences: The Cultural Consequences of Markets and Other Economic Institutions. Journal of Economic Literature 36 (1):75111.
Braumoeller, Bear. 2013. Is War Disappearing? Paper presented at the 109th Annual Meeting of the American Political Science Association, September, Chicago, IL.
Bueno de Mesquita, Bruce. 1981. The War Trap. New Haven, CT: Yale University Press.
Bueno de Mesquita, Bruce. 1985. Toward a Scientific Understanding of International Conflict: A Personal View. International Studies Quarterly 29 (2):121–36.
Bueno De Mesquita, Bruce, Morrow, James D., Siverson, Randolph M., and Smith, Alastair. 1999. An Institutional Explanation of the Democratic Peace. American Political Science Review 93 (4):791807.
Callen, Michael, Isaqzadeh, Mohammad, Long, James D., and Sprenger, Charles. 2014. Violence and Risk Preference: Experimental Evidence from Afghanistan. The American Economic Review 104 (1):123–48.
Cederman, Lars-Erik. 1997. Emergent Actors in World Politics: How States and Nations Develop and Dissolve. Princeton, NJ: Princeton University Press.
Cheung-Blunden, Violet, and Blunden, Bill. 2008. Paving the Road to War with Group Membership, Appraisal Antecedents, and Anger. Aggressive Behavior 34 (2):175–89.
Colgan, Jeff, and Weeks, Jessica. 2014. Revolution, Personalist Dictatorships, and International Conflict. International Organization 69 (1):163–94.
Dafoe, Allan, and Caughey, Devin M.. 2016. Honor and War: Using Southern Presidents to Identify Reputational Effects in International Conflict. World Politics 68 (2):341–81.
Dawes, Christopher T., Fowler, James H., Johnson, Tim, McElreath, Richard, and Smirnov, Oleg. 2007. Egalitarian Motives in Humans. Nature 446 (7,137):794–96.
Dawkins, Richard. 2006. The Selfish Gene. Oxford, UK: Oxford University Press.
Debs, Alexandre, and Goemans, Hein E.. 2010. Regime Type, the Fate of Leaders, and War. American Political Science Review 104 (3):430–45.
Debs, Alexandre, and Weiss, Jessica Chen. 2014. Circumstances, Domestic Audiences, and Reputational Incentives in International Crisis Bargaining. Journal of Conflict Resolution 60 (3):403–33.
Dekel, Eddie, Ely, Jeffrey C., and Yilankaya, Okan. 2007. Evolution of Preferences. Review of Economic Studies 74 (3):685704.
Delton, Andrew W., Krasnow, Max M., Cosmides, Leda, and Tooby, John. 2011. Evolution of Direct Reciprocity Under Uncertainty Can Explain Human Generosity in One-shot Encounters. Proceedings of the National Academy of Sciences 108 (32):13,335–40.
Downs, George W., and Rocke, David M.. 1994. Conflict, Agency, and Gambling for Resurrection: The Principal-Agent Problem Goes to War. American Journal of Political Science 38 (2):362–80.
Ekman, Paul. 1992. An Argument for Basic Emotions. Cognition and Emotion 6 (3–4):169200.
Fazal, Tanisha M. 2014. Dead Wrong? Battle Deaths, Military Medicine, and Exaggerated Reports of War's Demise. International Security 39 (1):95125.
Fearon, James, and Wendt, Alexander. 2002. Rationalism vs. Constructivism: A Skeptical View. In Handbook of International Relations, edited by Carlnaes, Walter, Risse, Thomas, and Simmons, Beth A., 5272. London, UK: Sage.
Fearon, James D. 1995. Rationalist Explanations for War. International Organization 49 (3):379414.
Fehr, Ernst, and Gächter, Simon. 2002. Altruistic Punishment in Humans. Nature (415):137–40.
Fey, Mark, and Ramsay, Kristopher W.. 2011. Uncertainty and Incentives in Crisis Bargaining: Game-Free Analysis of International Conflict. American Journal of Political Science 55 (1):149–69.
Frank, Robert H. 1988. Passions Within Reason: The Strategic Role of the Emotions. New York: W.W. Norton and Company.
Getmansky, Anna, and Zeitzoff, Thomas. 2014. Terrorism and Voting: The Effect of Rocket Threat on Voting in Israeli Elections. American Political Science Review 108 (3):588604.
Gilligan, Michael J., Pasquale, Benjamin J., and Samii, Cyrus. 2014. Civil War and Social Cohesion: Lab-in-the-field Evidence from Nepal. American Journal of Political Science 58 (3):604–19.
Ginges, Jeremy, and Atran, Scott. 2011. War as a Moral Imperative (not Just Practical Politics by Other Means). Proceedings of the Royal Society B: Biological Sciences 278 (1720):2930–38.
Ginges, Jeremy, Atran, Scott, Medin, Douglas, and Shikaki, Khalil. 2007. Sacred Bounds on Rational Resolution of Violent Political Conflict. Proceedings of the National Academy of Sciences 104 (18):7357–60.
Goldstein, Joshua S. 2011. Winning the War on War: The Decline of Armed Conflict Worldwide. London, UK: Penguin.
Güth, Werner, Schmittberger, Rolf, and Schwarze, Bernd. 1982. An Experimental Analysis of Ultimatum Bargaining. Journal of Economic Behavior and Organization 3 (4):367–88.
Hafner-Burton, Emilie M., LeVeck, Brad L., Victor, David G., and Fowler, James H.. 2014. Decision Maker Preferences for International Legal Cooperation. International Organization 68 (4):845–76.
Hatemi, Peter K., and McDermott, Rose, eds. 2011. Man Is by Nature a Political Animal: Evolution, Biology, and Politics. Chicago: University of Chicago Press.
Heifetz, Aviad, and Segev, Ella. 2004. The Evolutionary Role of Toughness in Bargaining. Games and Economic Behavior 49 (1):117–34.
Henrich, Joseph, Boyd, Robert, Bowles, Samuel, Camerer, Colin, Fehr, Ernst, Gintis, Herbert, and Mcelreath, Richard. 2001. In Search of Homo Economicus: Behavioral Experiments in Fifteen Small-Scale Societies. The American Economic Review 91 (2):73–8.
Henrich, Joseph, Boyd, Robert, Bowles, Samuel, et al. 2005. “Economic Man” in Cross-Cultural Perspective: Behavioral Experiments in Fifteen Small-scale Societies. Behavioral and Brain Sciences 28 (6):795815.
Hersh, Eitan D. 2013. Long-term Effect of September 11 on the Political Behavior of Victims’ Families and Neighbors. Proceedings of the National Academy of Sciences 110 (52):20,959–63.
Hirsch-Hoefler, Sivan, Canetti, Daphna, Rapaport, Carmit, and Hobfoll, E. Stevan. 2016. Conflict Will Harden your Heart: Exposure to Violence, Psychological Distress, and Peace Barriers in Israel and Palestine. British Journal of Political Science 46 (4):845859.
Horowitz, Donald L. 2003. The Deadly Ethnic Riot. Berkeley: University of California Press.
Horowitz, Michael C., and Stam, Allan C.. 2014. How Prior Military Experience Influences the Future Militarized Behavior of Leaders. International Organization 68 (3):527–59.
Huck, Steffen, and Oechssler, Jörg. 1999. The Indirect Evolutionary Approach to Explaining Fair Allocations. Games and Economic Behavior 28 (1):1324.
Johnson, Dominic D.P., and Fowler, James H.. 2011. The Evolution of Overconfidence. Nature 477 (7,364):317–20.
Johnson, Dominic D.P., Weidmann, Nils B., and Cederman, Lars-Erik. 2011. Fortune Favours the Bold: an Agent-based Model Reveals Adaptive Advantages of Overconfidence in War. PloS one 6 (6):e20,851.
Jones, Benjamin F., and Olken, Benjamin A.. 2005. Do Leaders Matter? National Leadership and Growth Since World War II. The Quarterly Journal of Economics 120 (3):835–64.
Kahneman, Daniel, and Tversky, Amos. 1979. Prospect Theory: An Analysis of Decision Under Risk. Econometrica 47 (2):263–91.
Kalyvas, Stathis. 2015. Is ISIS a Revolutionary Group and If Yes, What Are the Implications? Perspectives on Terrorism 9 (4). <>
Katzenstein, Peter J. 1996. The Culture of National Security: Norms and Identity in World Politics. New York: Columbia University Press.
Keohane, Robert O. 2005. After Hegemony: Cooperation and Discord in the World Political Economy. Princeton, NJ: Princeton University Press.
Kertzer, Joshua D. 2016. Resolve in International Politics. Princeton, NJ: Princeton University Press.
Krieger, D. 2011. The Challenge of Abolishing Nuclear Weapons. Piscataway, NJ: Transaction Publishers.
Kydd, Andrew H. 2016. Comparing Conventional and Nuclear Worlds. Manuscript, University of Wisconsin.
Lehmann, Laurent, and Feldman, Marcus W.. 2008. War and the Evolution of Belligerence and Bravery. Proceedings of the Royal Society of London B: Biological Sciences 275 (1653):2877–85.
Lerner, Jennifer S., Gonzalez, Roxana M., Small, Deborah A., and Fischhoff, Baruch. 2003. Effects of Fear and Anger on Perceived Risks of Terrorism: A National Field Experiment. Psychological Science 14 (2):144–50.
Lerner, Jennifer S., and Keltner, Dacher. 2001. Fear, Anger, and Risk. Journal of Personality and Social Psychology 81 (1):146–59.
LeVeck, Brad L., Hughes, D. Alex, Fowler, James H., Hafner-Burton, Emilie, and Victor, David G.. 2014. The Role of Self-interest in Elite Bargaining. Proceedings of the National Academy of Sciences 111 (52):18,536–41.
Lopez, Anthony C. 2016. The Evolution of War: Theory and Controversy. International Theory 8 (1):83139.
McDermott, Rose, Tingley, Dustin, Cowden, Jonathan, Frazzetto, Giovanni, and Johnson, Dominic D.P.. 2009. Monoamine Oxidase A Gene (MAOA) Predicts Behavioral Aggression Following Provocation. Proceedings of the National Academy of Sciences 106 (7):2118–23.
McElreath, Richard. 2003. Reputation and the Evolution of Conflict. Journal of Theoretical Biology 220 (3):345–57.
Meirowitz, Adam, and Sartori, Anne E.. 2008. Strategic Uncertainty as a Cause of War. Quarterly Journal of Political Science 3 (4):327–52.
Minozzi, William. 2013. Endogenous Beliefs in Models of Politics. American Journal of Political Science 57 (3):566–81.
Nepstad, Sharon Erickson, and Bob, Clifford. 2006. When Do Leaders Matter? Hypotheses on Leadership Dynamics in Social Movements. Mobilization: An International Quarterly 11 (1):122.
Nisbett, Richard E., and Cohen, Dov. 1996. Culture of Honor: The Psychology of Violence in the South. Boulder, CO: Westview.
Petersen, Roger D. 2002. Understanding Ethnic Violence: Fear, Hatred, and Resentment in Twentieth-Century Eastern Europe. Cambridge, UK: Cambridge University Press.
Pinker, Steven. 2011. The Better Angels of Our Nature: Why Violence Has Declined. London, UK: Penguin Books.
Powell, Robert. 1999. In the Shadow of Power. Princeton, NJ: Princeton University Press.
Powell, Robert. 2004. The Inefficient Use of Power: Conflict with Complete Information. American Political Science Review 98 (2):231–41.
Rand, David G., Tarnita, Corina E., Ohtsuki, Hisashi, and Nowak, Martin A.. 2013. Evolution of Fairness in the One-Shot Anonymous Ultimatum Game. Proceedings of the National Academy of Sciences 110 (7):2581–86.
Roth, Alvin E., Prasnikar, Vesna, Okuno-Fujiwara, Masahiro, and Zamir, Shmuel. 1991. Bargaining and Market Behavior in Jerusalem, Ljubljana, Pittsburgh, and Tokyo: An Experimental Study. The American Economic Review 81 (5):1068–95.
Ryan, Timothy J. 2017. No Compromise: Political Consequences of Moralized Attitudes. American Journal of Political Science 61 (2):409–23.
Sagan, Scott D., and Waltz, Kenneth N.. 1995. The Spread of Nuclear Weapons: A Debate. New York: W.W. Norton and Company.
Scheff, Thomas J., and Retzinger, Suzanne M.. 2002. Emotions and Violence: Shame and Rage in Destructive Conflicts. Bloomington, IN: iUniverse.
Schelling, Thomas C. 1960. The Strategy of Conflict. Cambridge, MA: Harvard University Press.
Sell, Aaron, Tooby, John, and Cosmides, Leda. 2009. Formidability and the Logic of Human Anger. Proceedings of the National Academy of Sciences 106 (35):15,073–78.
Slantchev, Branislav L. 2003. The Power to Hurt: Costly Conflict with Completely Informed States. American Political Science Review 97 (1):123–33.
Slantchev, Branislav L., and Tarar, Ahmer. 2011. Mutual Optimism as a Rationalist Explanation of War. American Journal of Political Science 55 (1):135–48.
Smith, Alastair. 1996. Diversionary Foreign Policy in Democratic Systems. International Studies Quarterly 40 (1):133–53.
Smith, Alastair, and Stam, Allan C.. 2004. Bargaining and the Nature of War. Journal of Conflict Resolution 48 (6):783813.
Stein, Rachel M. 2015. War and Revenge: Explaining Conflict Initiation by Democracies. American Political Science Review 109 (3):556–73.
Tajfel, Henri, and Turner, John. 1979. An Integrative Theory of Intergroup Conflict. In The Social Psychology of Intergroup Relations, edited by Austin, W.G. and Worchel, S., chap. 3. Monterey, CA: Wadsworth.
Thayer, Bradley A. 2000. Bringing in Darwin: Evolutionary Theory, Realism, and International Politics. International Security 25 (2):124–51.
Tversky, Amos, and Kahneman, Daniel. 1986. Rational Choice and the Framing of Decisions. Journal of Business 59 (4):251–78.
Voors, Maarten J., Nillesen, Eleonora E.M., Verwimp, Philip, Bulte, Erwin H., Lensink, Robert, and Van Soest, Daan P.. 2012. Violent Conflict and Behavior: a Field Experiment in Burundi. The American Economic Review 102 (2):941–64.
Wallace, Björn, Cesarini, David, Lichtenstein, Paul, and Johannesson, Magnus. 2007. Heritability of Ultimatum Game Responder Behavior. Proceedings of the National Academy of Sciences 104 (40):15,631–34.
Wolpert, David, Jamison, Julian, Newth, David, and Harre, Michael. 2011. Strategic Choice of Preferences: The Persona Model. B.E. Journal of Theoretical Economics 11 (1):137.
Young, H. Peyton. 1993. An Evolutionary Model of Bargaining. Journal of Economic Theory 49:145–68.
Zeitzoff, Thomas. 2014. Anger, Exposure to Violence, and Intragroup Conflict: A “Lab in the Field” Experiment in Southern Israel. Political Psychology 35 (3):309–35.
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