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We study the potential role and advantages of a multinational carbon-credit (CC) market allowing a set of countries to procure CCs for their domestic producers. We study the interaction of such a market with renewable portfolio standards, specifically regarding whether a country’s government or its energy producers are responsible for upholding the renewable portfolio standards (RPS), and how this impacts total emissions and energy mix. Implementing uniform carbon tax policies or cross-border emission trading systems hinders individual countries’ autonomy while strictly segregated carbon markets suffer from the tragedy of the commons. We develop a model where countries can have their own policies to allocate the CCs, which may include taxes or subsidies depending upon the country’s choices. We use a special form of equilibrium programs with equilibrium constraints (EPEC) game – Nash Among …