The book "Preferential Rules of Origin" by Rodrigo Novoa offers a comprehensive analysis of the rules of origin in the context of free trade agreements, particularly the US-Chile Free Trade Agreement, which came into effect on January 1, 2004. It examines the development and impact of these rules on trade between the United States and Chile, focusing on the gradual reduction of tariffs and non-tariff trade barriers. The work highlights the importance of determining the origin of goods and the associated challenges arising from complex trade regulations. The comprehensive rules of origin established under the agreement are crucial for ensuring that the benefits of free trade genuinely accrue to the member countries. This specialized book is aimed at students, researchers, and professionals engaged in international trade relations and the legal frameworks governing trade.