通过分析城市化进程中粮价涨跌现状,构建了一个关于“市场格局—价格陷阱—政府管制”的理论范式,从而揭示粮食市场“分散生产—集中流通—分散消费”格局形成的内在动因及生产、流通环节之间的内在作用机理。该范式认为:生产环节规模收益递减,流通环节规模收益递增;环节之间有效规模差异导致粮食市场呈现“两头大、中间小”的失衡状态;政府通过控制流通领域,发挥数量调控和价格调控的互补优势,可以有效克服粮食市场的“价格陷阱”。在此基础上指出:通过改变生产要素密集度可以扩大生产环节的内在有效规模;通过生产环节生产规模的横向扩张,则可以实现生产环节向流通环节的纵向延伸。 By analyzing the status quo of food price fluctuation in the process of urbanization, a theoretical paradigm on “market pattern - price trap - government regulation ” is constructed to reveal the formation of the pattern of “decentralized production - centralized circulation - decentralized consumption” in the grain market The intrinsic motivation and the internal mechanism of production and circulation. The paradigm states that the scale returns in the production chain decrease and the returns to scale increase in the circulation chain. The effective scale difference between the links leads to the unbalanced status of the grain market in the areas of “two big heads and small middle ones.” Through the control of circulation, the government plays a role of quantity control and price The complementary advantages of regulation can effectively overcome the “price trap” of grain markets. On this basis, it is pointed out that by changing the density of factors of production, the internal effective scale of the production link can be expanded; and through the horizontal expansion of the production scale in the production link, the vertical extension of the production link to the circulation link can be realized.