noun
open shop system
A labor policy where a workplace may hire both union and non-union workers, without requiring union membership as a condition of employment. Contrasts with ユニオンショップ制 (union shop).
Antonyms: ユニオンショップ制
この会社はオープンショップ制を採用しているため、組合員でなくても働ける。
Because this company uses an open shop system, you can work there even if you are not a union member.