Harvard Business School professor Geoffrey Jones examines the career of Ernesto Tornquist, a cosmopolitan financier considered to be the most significant entrepreneur in Argentina at the end of the 19th century. He created a diversified business group, linked to the political elite, integrating Argentina into the trading and financial networks of the first global economy. The case, “Ernesto Tornquist: Making a Fortune on the Pampas,” provides an opportunity to understand why Argentina was such a successful economy at this time, and to debate whether its very success laid the basis for the country’s subsequent poor economic performance.