co-prosperity sphere
Historical and political term, most famously used in 大東亜共栄圏 (Greater East Asia Co-Prosperity Sphere). Rarely used outside that context.
The Greater East Asia Co-Prosperity Sphere was a wartime Japanese slogan.
Compound of 共栄 (co-prosperity) and 圏 (sphere, area). The term was coined in the early 20th century and is strongly associated with Japanese wartime propaganda.