The Spanish silver real as the first global money
The silver peso of eight reales, minted from American silver, became the first currency used on every inhabited continent. After Manila's founding in 1571 linked American mines to Chinese demand for silver, a Spanish-carried monetary circuit joined the Americas, Europe and Asia — the birth of sustained global trade in the account of Flynn and Giráldez.
Why this wins its question: The real's global role is usually a one-line trivia item. This object grounds it in the economic-history literature (Flynn-Giráldez thesis, Hamilton's series) and connects it to the Salamancan monetary theory it provoked — a linked, claim-bound account no general source offers.
Claims
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Flynn and Giráldez date the birth of global trade to 1571, when the founding of Spanish Manila created the first direct, substantial and continuous trade link between America and Asia, with silver flowing to China against Asian goods.
China's fiscal and monetary demand for silver was the engine of the circuit: American silver commanded a premium in China, and the Manila galleons arbitraged that differential for two and a half centuries.
Hamilton's price series documented the scale of registered bullion imports into Seville and their association with the Castilian price revolution of the 16th century — the inflation the Salamanca theologians were first to explain monetarily.
The peso of eight reales circulated as a trade and reserve coin in Europe, the Americas and Asia, making it the nearest thing to a world currency before the 19th century.