Tariff History 87 Law and legislation 81 Customs administration 53 Commercial policy 24 Foreign trade regulation 24 Protectionism 20 more ... Politics and government 17 Free trade 15 Commerce 14 Exports 14 Taxation 12 Excise tax 10 Smuggling 8 Trade regulation 7 Criminal provisions 6 Industrial policy 6 Economic conditions 5 Law 5 Tonnage fees 5 Constitutional law 4 Economic history 4 Foreign economic relations 4 Glass manufacture 4 Economic aspects 3 Economic policy 3 Finance, Public 3 Glass trade 3 Import quotas 3 International trade 3 less ...