Nihon no safety net no kakusa—rōdō shijo no henyō to shakai hoshō (Inequality of the Safety Net in Japan—The Transformation of the Labour Market and Social Security), by SakaiTadashi. Tokyo: Keio Daigaku Shuppankai, 2020, 352 pp., ¥2,970 (ISBN 978-4-7664-2649-6)