This study examines the impact of British capital flows on the evolution of capital markets in four countries - Argentina, Australia, Canada, and the United States - over the years 1870 to 1914. In substantive chapters on each country it offers parallel histories of the evolution of their financial infrastructures - commercial banks, non-bank intermediaries, primary security markets, formal secondary security markets, and the institutions that provide the international financial links connecting the frontier country with the British capital market. At one level, the work constitutes a quantitative history of the development of the capital markets of five countries in the late nineteenth century. At a second level, it provides the basis for a useable taxonomy for the study of institutional invention and innovation. At a third, it suggests some lessons from the past about modern policy issues.