农村经济体制改革以来，我国已对粮食、棉花、成品油等重要农产品的购销体制进行了改革，由过去的统购统销制改为合同定购制，政府已几次提高重要农产品收购价格，并逐步缩小合同定购价与市场价的差异。我国正处于计划经济体制向市场经济体制转化过程中，市场体系还不健全，因 Since the reform of the rural economic system, China has reformed the purchasing and marketing system of important agricultural products such as grain, cotton and refined oil products. From the previous system of unified state procurement and marketing to the contractual ordering system, the government has several times raised the purchase price of important agricultural products and gradually reduced The difference between the contract price and the market price. Our country is in the process of transforming the planned economy to the market economy and the market system is still not perfect because