The decentralized and social planer's model are different. The social planner's problem focuses on the whole market, but the decentralized problem focuses on the representative firm. The assumptions of the two model are the same, but the formulation are diffierent because one focuses on mkt, the other focuses on individual firm

实用上说来，是经济体制即经济组织方式的差别

`````````那就看你怎么理解两个的影子价格了

再是为了以后讨论的简单