Historical term for a traditional Japanese rotating savings and credit association, similar to 頼母子講 (たのもしこう). Rare in modern usage.
During the Edo period, mutual financing associations were widely used as a means of finance among common people.
From 無尽 (むじん, 'inexhaustible') and 講 (こう, 'association'). The exact historical derivation is uncertain; the term refers to a mutual financing group.