Two-Level Game Theory in World Politics: Domestic Constraints and International Negotiations

Abstract

Robert D. Putnam's (1988) two-level game theory holds that national leaders negotiate simultaneously with foreign counterparts and with domestic constituencies whose approval determines whether an agreement can be implemented. This article argues that domestic political constraints frequently determine the success or failure of international agreements and, in doing so, shape the architecture and effectiveness of global politics. It reviews the theory's core concepts, namely Level I and Level II bargaining, the win-set, involuntary and voluntary defection, the Schelling conjecture, and synergistic and conflictual linkages, and applies them through a common analytical template to three cases. Woodrow Wilson's defeat in the United States Senate over the Treaty of Versailles and the League of Nations illustrates success at Level I and collapse at Level II: an empty domestic win-set producing involuntary defection. The positions of the United States and Israel toward the International Criminal Court illustrate a different pattern, active participation in negotiating the Rome Statute followed by deliberate non-accession grounded in persistent, near-empty domestic win-sets. The article then considers the implications for multilateralism, institutional legitimacy, and the enforceability of international law, and for trade, climate, arms control, and human-rights regimes. A third case, Nigeria and the African Continental Free Trade Area (AfCFTA), shows how constitutional dualism, stakeholder opposition, and delayed signature produce a Level II dynamic outside the great powers. It concludes that the theory remains an indispensable lens for understanding the limits of international cooperation and that leaders who neglect Level II constraints risk producing agreements that cannot be delivered.