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Chōshi is known as a center of soy sauce production. Production methods were introduced to Chōshi in 1616 from Settsu Province, and later from Kii Province, both near the Seto Inland Sea. Soy sauce manufacturers Higeta and Yamasa are based in Chōshi. The Port of Kashima in nearby Kashima City, Ibaraki Prefecture, is utilized to import soybeans for use in soy sauce production. The remains of soybeans not used in soy sauce production in Chōshi are returned to Kashima for production into feed for livestock.