Tokugawa monetary system

Tokugawa Tri-metallic Monetary System

Gold, silver, and copper-or-iron money circulated together without sharing one invariant valuation rule.

徳川三貨制度Tokugawa sankaseido

表Exact image unavailable 裏Exact image unavailable

Core routes: 14
Issue studies: 12
Recoinage records: 21
Local status: Published

Context

Historical and monetary setting

Gold used declared ryō-bu-shu relationships, ordinary silver circulated chiefly by weight in monme, and cash was counted in mon. Official conversions changed, while market exchange moved separately.

Identification

How to classify the object

A value statement must name its branch, rate type, and date context; 1 ryō = 4 bu = 16 shu does not flatten silver and copper into fixed denominations.

Evidence boundary

What this page does not claim

Official conventions are not presented as universal transaction rates or modern purchasing-power equivalents.

Valuation

Accounting and exchange relationships

Fixed gold accounting, official cross-metal conventions, and market exchange are different evidence classes.

Type	Period	Relationship	Boundary
fixed-accounting-relationship	Tokugawa period	1 ryo = 4 bu = 16 shu	This is an accounting relationship within declared-value gold, not a universal market exchange rate among all three metals.
official-convention	Early Tokugawa	1 ryo = 50 monme silver = 4,000 mon copper	The Currency Museum presents this as an early official convention; actual exchange moved with market conditions.
official-convention	Eighteenth century	1 ryo = 60 monme silver = 4,000 mon copper	An official convention used for explanation, not a promise that every transaction cleared at this rate.

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Related Edo references

Edo Denominations and Accounting Units Tokugawa Recoinages

Evidence

Sources and scope

These links support the claims on this page. Source authority does not imply permission to republish source images.

Frequently Asked Questions: Currency in the Edo Period Bank of Japan Currency Museum

Tri-metallic structure, 1 ryo = 4 bu = 16 shu, monme weight, and the distinction between official and market exchange.

Open source

Money and Society in the Edo Period: Three-Currency System Bank of Japan Currency Museum

Gold, silver, and copper valuation conventions; Oban, Chogin, and Mameitagin roles.

Open source

Research on the Tokugawa Tri-metallic Monetary System Institute for Monetary and Economic Studies, Bank of Japan

Scholarly framing of fluctuating exchange among gold, silver, and copper monies.

Open source