Promise Notes - The Foundation of Modern Banking

Why It Matters

Grasping the promise‑note origin of fractional‑reserve banking reveals why confidence and liquidity management remain critical to preventing banking crises today.

Key Takeaways

• Goldsmiths issued transferable paper receipts for deposited gold.
• Receipts became informal currency, facilitating trade across towns.
• Goldsmiths began lending against receipts, creating early credit.
• Money supply expanded without new coins, relying on confidence.
• System collapsed if many holders demanded redemption simultaneously.

Summary

The video traces the birth of modern banking to 17th‑century London, where trusted goldsmiths began safeguarding customers' gold coins and issuing paper promises—known as promise notes—as proof of deposit. These notes could be redeemed at any goldsmith, turning a simple receipt into a portable claim on gold.

Because the notes were accepted universally, they quickly became a de‑facto medium of exchange. Goldsmiths recognized that most depositors never reclaimed their metal, so they started loaning out “fake” promise notes, charging interest and earning a profit. This practice effectively created new money without minting additional coins, illustrating the earliest form of fractional‑reserve banking.

A striking example cited is a goldsmith who loaned out 100 coins, wrote a note worth 100 coins, and let the borrower spend it. When the borrower repaid the loan with interest, the goldsmith netted 105 coins, while the economy’s money supply had risen by 100 coins solely through bookkeeping. The system relied on the assumption that not everyone would demand redemption at once.

The lesson underscores how confidence underpins banking: as long as holders trust the notes, the system thrives; a sudden rush for redemption can trigger collapse. Understanding this origin clarifies contemporary debates on liquidity, reserve ratios, and the systemic risks inherent in modern credit creation.

Original Description

Long before modern banking was introduced, goldsmiths became the go-to people to trust with your money. In 17th-century London, they stored customers’ gold securely in their vaults and issued handwritten receipts known as promise notes as proof of deposit.

But then something interesting started happening. Instead of returning to collect their gold, people began using these notes to pay one another. The paper itself had value because it could be exchanged for gold at any time.

Promise notes became the foundation of a new financial system, paving the way for banknotes, credit, and modern banking as we know it today.