This book provides a detailed and compelling guide to the life and economic work of Gerónimo de Uztáriz. It contextualises his work within the economic and political trends of the time, including the Enlightenment, Spanish liberalism, and colonial empires. Particular attention is given to de Uztáriz?s seminal work Theórica y Práctica de comercio y de marina and how it achieved international circulation and recognition. Its influence on 18th century Spain is examined, alongside a detailed analysis of the trade systems of the day. The translation and reception of Theórica in France, Great Britain, Italy, Ireland, and Germany is also discussed. This book aims to shed new light upon the economic work of Gerónimo de Uztáriz and highlights why his ideas remain relevant and important. It will be of interest to students and researchers working within modern history and the history of economic thought.