dōza

was the Tokugawa shogunate's officially sanctioned copper monopoly or copper guild (za) which was created in 1636 and (1701–1712, 1738–1746, 1766–1768).

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was the Tokugawa shogunate's officially sanctioned copper monopoly or copper guild (za) which was created in 1636 and (1701–1712, 1738–1746, 1766–1768).

Initially, the Tokugawa shogunate was interested in assuring a consistent value in minted copper coins; and this led to the perceived need for attending to the supply of copper.