Résumé : This thesis studies monetary regimes, financial and trade networks and how they are intertwined. The project considers the late 19th century as laboratory since these factors experienced major changes during that period. This research investigates, first, how network externalities influenced the fate of the international monetary system. It emphasizes then how financial access to short-term capital shaped international trade flows. The thesis highlights the importance of the London Money market, with its sterling bill market, for that matter. Finally, this thesis outlines how the deployment of what was perhaps the most disruptive ICT innovation of all times (i.e., the introduction of the telegraph) evolved with the web of financial interlinkages at the global level.