OPEC Agricultural policies 1 Arabian countries 1 Commerce 1 Economic Assistance 1 Economics 1 Equilibrium 1 General agreement on tariff 1 Government 1 Industrialisation 1 International economic relations 1 International trade 1 Islamic dimensions 1 Labour economics 1 OPEC and GATT trade 1 Oil and Petroleun Exporting Countries 1 Organization of petroleum exporting countries 1 Organization of the Petroleum Exporting Countries 1 Persian Gulf 1 Petroleum 1 Petroleum Industry and trade 1 Political Science 1 Politics 1 Trade 1 Trade organizations 1 United States 1