About ancient China's Zhou Dynasty Knife Money and Spade Money, bronze tools converted into currency before round coins existed.
While the Mediterranean world was developing round stamped electrum coins, ancient China during the Spring and Autumn and Warring States periods (770–221 BCE) took a completely different evolutionary path: casting currency in the shape of functional bronze tools and weapons.
Known as Knife Money (Dao Bi) and Spade Money (Bu Bi), these heavy bronze implements represent one of the most distinctive monetary experiments in antiquity.
From Barter Tools to Symbolic Currency
In early Bronze Age China, practical farming spades and hunter-warrior knives were highly valued trade goods. Over time, as commerce expanded under the Zhou Dynasty, metalworkers began casting smaller, unsharpened bronze versions specifically designed to serve as money.
Spade money retained the hollow socket where a wooden handle once fit, while knife money featured a ring handle at the end so merchants could string dozens of bronze knives together onto leather thongs for easy transport.
Regional Monopoly Currencies
Different Warring States adopted distinct knife and spade designs as legal tender:
- State of Qi: Cast large, heavy "Qi Knives" (up to 18 cm long) stamped with inscriptions like "Qi Fa Huo" (Legal Currency of Qi).
- State of Yan: Issued distinctive "Ming Knives" stamped with the character Ming.
- States of Zhao and Han: Cast square-foot and pointed-foot bronze spades inscribed with their city of origin.
The Standardization of Qin Shi Huang
In 221 BCE, Qin Shi Huang unified China as its first Emperor. To consolidate control, he outlawed all regional knife, spade, and shell currencies under threat of death, establishing the famous round copper Ban Liang coin with a square hole in the center—a shape representing Earth (square) inside Heaven (circle) that endured in Chinese coinage for over 2,000 years.
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