Economic Interdependence and World Politics

The Interdependence Thesis

The idea that trade promotes peace is one of the oldest claims in international relations, dating back to Montesquieu and Kant in the eighteenth century. The modern version, associated with scholars like Robert Keohane and Joseph Nye, argues that complex interdependence — dense networks of trade, investment, and financial flows between states — transforms international politics by creating mutual vulnerability and raising the costs of conflict.

When two economies are deeply intertwined, war between them becomes economically irrational. Disrupting trade, seizing assets, and breaking supply chains would impose enormous costs on both sides. This logic underpinned the European integration project from the start: the European Coal and Steel Community, established in 1951, deliberately merged French and German heavy industry so that war between them would become materially impossible.

Weaponized Interdependence

The optimistic view of interdependence has been severely challenged in the 2020s. Scholars Henry Farrell and Abraham Newman introduced the concept of 'weaponized interdependence' — the ability of states that control key nodes in global networks to exploit those positions for strategic advantage.

The United States has leveraged its dominance of the dollar-based financial system to impose sanctions that cut targeted countries off from global finance. Control over semiconductor supply chains gives the US and its allies enormous leverage over China's technological development. Russia's control of natural gas pipelines to Europe gave it coercive power over European energy security — until Europe painfully diversified after 2022.

These examples show that interdependence is not symmetric. When one side is more dependent than the other, or when one side controls a chokepoint in the network, interdependence becomes a source of power rather than mutual restraint. The country that controls the node can weaponize the relationship; the dependent country is vulnerable.

The Decoupling Debate

The 2020s have witnessed a global rethinking of economic interdependence. The COVID-19 pandemic exposed the fragility of global supply chains. US-China technological competition has led to export controls on advanced semiconductors. Russia's invasion of Ukraine triggered the largest sanctions regime in history and a rapid European effort to eliminate dependence on Russian energy.

The question facing policymakers is whether to pursue 'decoupling' (severing economic ties with rivals), 'de-risking' (reducing dependence in critical sectors while maintaining broader trade), or continued integration. Full decoupling between the US and China would be extraordinarily costly — bilateral trade exceeds $700 billion annually. De-risking is more practical but requires identifying which sectors are truly strategic and accepting higher costs in those areas. The era of naive globalization optimism is over, but the world remains deeply interconnected.