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Given that states are self-interested actors, why do IOs exist? - Freshman Essays

Given that states are self-interested actors, why do IOs exist?

(1) Given that states are self-interested actors, why do IOs exist?

(2) What IOs, or kinds of IOs, do you find the most effective or necessary in international politics and why? Please differentiate between different types of IOs (e.g., IGOs, NGOs) to explain your answer.