The article explores the world of global currency markets, focusing on the activities of money changers. It delves into how money changers buy and sell currencies, arrange deals, and the key players in the market. The article also discusses the historical geography of money changer enclaves and the reasons behind their clustering. It examines different trading strategies and the factors that influence currency rates. Additionally, it looks at the evolution of currency delivery systems and the impact of events like September 11, 2001, on global payments. The article also touches on the introduction of the Euro and the doubts surrounding its potential as a world currency.