Mechanism Design of the East Asian Financial Systems to Achieve Sustainable Development : International Public Goods and Japanese?US Cooperation

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We can obtain numerically the optimal solution of public good in an international public good model with N-country and different productivities. The optimal solution is depending on the income distribution among N countries and on the number of countries. Also, whether the country is contributor or non-contributor is depending on the size of these parameters. Which improve the social welfare and the number of contributors for ODA policy of developed countries, international public good gift or money gift? It is international public good gift.