Oyaichi

…After the Kamakura period, with the development of the commodity-money economy, regular markets began to be held nationwide, but many of the regular markets established within a country or a certain region tended to decide their opening dates based on the market days of the most central market in each region, and the prices at the market were also determined according to the prices at the central market. The central market in such a network of regular markets within a country or a certain region was called a provincial market or parent market, and some were held on the first day. During the Nanboku-cho period, Nagano City in Aichi County, Omi Province, bordered the Nakasendo road and was geographically located in the center of the country, so it was called a parent market and was a one-day market. …

*Some of the terminology that refers to "parent city" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…鎌倉時代以降商品貨幣経済の発展につれて全国的に定期市が開かれるようになったが，一国内あるいは一定地域内に成立した多くの定期市は，それぞれの地方のもっとも中心的な市の市日を基準にして開催日が決められたり，市での価格も中心市の価格に準じて決定される傾向が強まっていた。こうした一国あるいは一定地域内の定期市網のなかでの中心的な市が国市，親市とよばれ，一の日に開かれるものがあった。南北朝時代，近江の愛智郡の長野市は中山道に接し，地理的に国の中心部に位置していたためか親市と称され，一日市であった。…

※「親市」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報