social surplus
社会的余剰
economic surplus
/suto3/google.iconsocial surplus
/suto3/Google画像検索.iconsocial surplus
/suto3/Google定義検索.icon social surplus
/suto3/wikipedia.iconsocial surplus
/suto3/weblio.icon social surplus
/suto3/kotobank.icon social surplus
/suto3/jisho.icon social surplus