3.2 Domestic Laws As the source of intemational economic law,the domestic laws means those whichregulate foreign economic relations.Those domestic laws which only regulate domestic relations are not the source of intemational economic law. 3.3 Other Sources 3.3.1 Judicial precedent In common-law countries,judicial precedents may be regarded as the source of interantional conomic law. But in continental countries,judicia precedents are not the source of intemational economic law 3.3.2 Doctrines Doctrines could effect intemational economic law but are not the source of intemational economiclaw. Section 4 Er ergence and Development of International Economic Law 4.1 Before the 19th century 4.2 From the 19th century to WarII 4.3 After WarⅡ Section 5 Basic Principles of International Economic Law 5.1 Principle of Economic Sovereign 5.2 Principle of Equity(Equality)and Mutual Benefit 5.3 Principle of International Cooperation 5.4 Pacta sunt servanda(Agreements of the Parties must be observed) 5 3.2 Domestic Laws As the source of international economic law, the domestic laws means those which regulate foreign economic relations. Those domestic laws which only regulate domestic relations are not the source of international economic law. 3.3 Other Sources 3.3.1 Judicial precedent In common-law countries, judicial precedents may be regarded as the source of interantional economic law. But in continental law countries, judicial precedents are not the source of international economic law. 3.3.2 Doctrines Doctrines could effect international economic law but are not the source of international economic law. Section 4 Emergence and Development of International Economic Law 4.1 Before the 19th century 4.2 From the 19th century to WarⅡ 4.3 After WarⅡ Section 5 Basic Principles of International Economic Law 5.1 Principle of Economic Sovereign 5.2 Principle of Equity(Equality) and Mutual Benefit 5.3 Principle of International Cooperation 5.4 Pacta sunt servanda (Agreements of the Parties must be observed)