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This book offers a comprehensive examination of the Customs Tariff-its structure, purpose, and role in global trade by combining economic theory, international governance, practical application, and contemporary policy issues. It begins by introducing the fundamentals of the Customs Tariff and the economic principles behind supply, demand, and the impact of unit taxes such as import duties. It then explores the global institutions that shape tariff policy: the World Trade Organization (WTO) and the World Customs Organization (WCO), explaining their roles in regulating international trade and maintaining the Harmonized System used worldwide.

A substantial portion of the book focuses on the structure and mechanics of the tariff itself, including commodity codes, General Interpretative Rules (GIRs), duty rates, tariff engineering, quotas, and non-tariff measures such as anti-dumping and countervailing duties. It explains how tariffs function as fiscal tools, regulatory mechanisms, and political instruments-covering topics like tariff inversion, protectionism, and the weaponization of tariffs in foreign policy.

The book also addresses modern trade challenges, including supply-chain risk, rules of origin, trade creation and diversion, and the operation of free-trade agreements and customs unions. It highlights the importance of competence and awareness among traders and customs professionals when navigating tariff systems. Later chapters examine recent U.S. tariff policies, including Section 301 and 232 actions, and discuss how tariffs are used to protect domestic industries or influence international behavior. The book concludes by considering the growing role of artificial intelligence in tariff classification and compliance, and reflects on the future of tariff policy in an evolving global trade environment.