International trade led to the need for a global currency.

Evidence

It is a fine example of how the continents of the world were for the first time being linked together by ships and by trade. … This new world now needed a functioning means of exchange – an international currency. — Neil MacGregor, A History of the World in 100 Objects, 1221

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 1221
• XREF: connects to: The introduction of coinage enabled new forms of trade and trust in economic systems. — Neil MacGregor, A History of the World in 100 Objects, 426; The Spanish discovered silver mines that powered the first global currency. — Neil MacGregor, A History of the World in 100 Objects, 1138; Bargaining exchange predates fixed-price commerce in many regions — Georg Simmel, on individuality and social forms_…, 265 (+3 more)