Which term describes Song economic instruments used for long-distance payments?

• A. Flying money
• B. Promissory notes
• C. Banknotes
• D. Credit lines

Answer: (D)

The key idea is how the Song economy moved value across distances through credit-based arrangements rather than carrying coin. A line of credit is a standing permission from a lender to a borrower to access funds up to a set limit, repayable over time. For merchants, this meant they could buy goods in distant markets and settle debts later, or pay suppliers across provinces without transporting heavy money. This reflects how Song traders and institutions organized long-distance payments around trust and credit, which is why credit lines best describe the mechanism involved.

While flying money and promissory notes are real instruments used in that era, they are specific forms of transferring value or promises to pay. Banknotes denote the currency itself, whereas credit lines specifically capture the ongoing, arranged capability to settle transactions over long distances through credit, matching the concept tested.