ACCorDing to thE pAssAgE, moDErn soCiEtiEs Control supply AnD DEmAnD ______. A、By Fixing priCEs in spECiFiC inDustriEs B.By mEAns oF monEy AnD thE priCE mEChAnism C.By kEEping A wAtChFul EyE on rElAtivE priCE ChAngEs D.By DirECt intErvEntion in thE priCing oF gooDs AnD sErviCEs