Reform of the United Nations Security Council: Equity and Efficiency

Twenty years of negotiations over reform of the United Nations Security Council (UNSC) are yet to bear fruit. We use recent advances in the theory of a-priori voting power to present a formal quantitative appraisal of the structural reforms contained within eleven current reform proposals, and the separate effect of expansion of the UNSC membership. Only two reform proposals - the EU acting as a single entity, or a weakening of the veto power for permanent members - robustly dominate the status quo against our measures of equity and efficiency. Several proposals may actually worsen the issues they ostensibly claim to resolve.