Moving a promise instead of carting coins around Europe was a clever solution. Bills of exchange enabled merchants to arrange payments across places and currencies without transporting an equivalent hoard of coin on every journey.
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The instrument tied merchants, correspondents, due dates and exchange quotations into networks of trust and enforceable claims. The sophistication of the correspondent networks is easy to underestimate.
It did not eliminate fraud, liquidity problems or exchange-rate exposure; it reorganized who bore those risks. Risk wasn't magically erased; it changed hands and form.
The interest-ban debate makes the legal side just as fascinating as the financial one. Historians debate how far exchange techniques also responded to restrictions on openly charging interest.
Was their greatest innovation moving money, extending credit or making distant commercial promises more credible?