International organizations’ (IOs) power in shaping global governance outcomes is not only determined by the formal delegation of tasks and issue areas but also by the necessary capabilities to fulfill these tasks. Yet, extant research on the delegation of power to IOs gives few insights into the financial and staff capabilities of IOs and focuses mainly on the formal rules that specify IOs’ tasks and issue scope. To address these limitations, this paper makes three contributions. First, we propose a more encompassing concept of IO power which incorporates three principal components: tasks, issue scope, and capabilities. Second, we introduce a new concept – IO empowerment (IOE) – which encapsulates formal and informal changes in IO power over time. Third, we introduce a novel dataset on IO capabilities, which measures the formal rules governing IO staff and financial resources as well as the actual capabilities available to six well‐known IOs over 65 years. These original data show that capabilities vary not only across IOs but also over time.

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The international economic system that emerged after the 1944 Bretton Woods conference became the most durable international arrangement devoted to economic openness. Seventy-five years after the conference, however, global shifts in power, institutional gridlock, and populist backlash figure prominently in accounts predicting the system's demise. This article examines the legacies of the Bretton Woods conference for structures and practices of global economic governance and innovations that emerged over time to adapt the system to new political and economic circumstances. It explores how and why the Bretton Woods system became a more variegated system over time with respect to four features of governance: membership, legalization, organizational focality, and market embeddedness. It identifies sources and effects of expanding membership in the International Monetary Fund and the World Bank, the emergence of new formal and informal institutions, the challenges of a more fragmented institutional landscape, and shifts in the underlying principles of economic governance. Finally, the article discusses lessons from past crises in and reforms to the Bretton Woods system, and their implications for understanding recent challenges to global economic cooperation.