Part III The Common Theory ofEcologicalEconomy System inner connection of E.E.S development of social productivity promotes the relationship of ecological economy. inner relationship of E.E.S Th positive and negative feedback mechanism of E.E.S The negative feedback mechanism of ecological system 米 The positive feedback mechanism of economic system 43:The coupling of ecological system and economic system 4.2 The inner connection of E.E.S Part III The Common Theory of Ecological Economy System A. The development of social productivity promotes the relationship of ecological economy. B. The inner relationship of E.E.S C. The positive and negative feedback mechanism of E.E.S * The negative feedback mechanism of ecological system * The positive feedback mechanism of economic system 4.3 The coupling of ecological system and economic system