Power and Interdependence: World Politics in Transition

Keohane and Nye specify three characteristics. First, multiple channels connect societies: interstate relations, transgovernmental ties among sub-units, and transnational relations across borders . Second, there is no hierarchy among issues: military security does not consistently dominate the agenda, and the line between domestic and foreign policy blurs . Third, military force plays a minor role: when complex interdependence prevails, force is not an appropriate means for resolving disagreements on economic or ecological issues, though it may remain relevant in relations with rivals outside the interdependent zone .

Sensitivity interdependence measures the costly effects of external changes before an actor attempts to alter policy—how quickly changes in one country impose costs on another under existing rules . Vulnerability interdependence measures the cost of adjusting to external changes after policies have been altered—whether an actor can find alternatives and at what cost . Keohane and Nye argue that vulnerability asymmetries provide more significant bargaining power than sensitivity asymmetries, because vulnerability captures the ability to escape a costly relationship, not merely to endure it .

Waltz's structural realism assumes power is fungible: military capability in one issue area translates into influence across all others . Keohane and Nye reject this. Under complex interdependence, power resources are issue-specific; military force does not guarantee influence in economic or ecological negotiations . They also argue that states are not the only significant actors—transnational corporations, international organizations, and transgovernmental networks matter independently. Waltz predicted that powerful states would link issues and impose outcomes; Keohane and Nye show linkages are harder to make when force is ineffective, and weak states can use international organizations to erode hierarchy .

Power and Interdependence reframed international cooperation as possible without hegemony or world government. By showing that regimes—sets of governing arrangements affecting interdependence—can reduce transaction costs and facilitate decentralized cooperation, Keohane and Nye provided the theoretical bridge between liberal interdependence theory and realist assumptions about state egoism . Keohane later developed this into After Hegemony. The book established that institutions matter independently of power distributions, launching a research agenda on regime effectiveness, compliance, and institutional design that dominated IR scholarship for decades .

Power and Interdependence was first published by Little, Brown in 1977, with the subtitle 'World Politics in Transition' . It drew on research conducted under the auspices of Harvard's Center for International Affairs . A second edition followed, and a third edition appeared in 2001 through Longman . In 1987, the authors published a reassessment in International Organization, reviewing how their arguments had held up and noting that constraints on the use of force had remained robust . The 1998 article 'Power and Interdependence in the Information Age' extended the framework to information flows.

A frequent misreading treats complex interdependence as a description of the entire international system, implying that military force is globally obsolete. Keohane and Nye explicitly present it as an ideal type—a benchmark against which to measure reality, not a portrait of all international relations . They acknowledge that intense relationships of mutual influence may coexist with military conflict outside the interdependent zone. The book argues that complex interdependence processes are more likely to emerge under certain conditions, not that they characterize all issue areas or all dyads equally. Power politics does not vanish; it operates through different mechanisms.