The growth of an 'imperial' outlook in colonial policy at the end of the nineteenth century led to calls for greater imperial integration, which prompted studies and scholarly works on the economic relations between Britain and its imperial possessions. This volume, first published in 1903 and written by the economist John William Root, explores both the internal and external trade relations in the British Empire and its constituent colonies. Focusing on the practical aspects of international trade, Root discusses the customs policies and tariffs, main imports and exports and external influences on trade of the United Kingdom, New Zealand, Australia, the West Indies and Canada. Organised by geographical region, the book also discusses fiscal warfare and the effect of preferential trade tariffs, using Canada as an example. This volume provides a detailed analysis of the system of trade regulations and their impact on imperial trade in the early twentieth century.