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ery costly, the difficulty is particularly large. The pursuit of economic efficiency to maximize the producer, in the "government regulatory vacuum" and difficult for consumers to find their quality under the aegis of the dual problem, accusing him of "standard discount" for production. In addition, a sound agricultural product quality safety management system and the lack of means, the right to monitor the quality and safety of agricultural products, the producer may be produced before a set of monitoring, monitoring production after another, which resulted in the failure of the government's monitoring and management , resulting in the government and there is information asymmetry between producers. Therefore, with respect to the government, producers and traders generally have more information about the quality and safety of agricultural products.
Third, in the agricultural industry chain exists between the production and management information asymmetry. First, the upper and lower levels in the chain of information asymmetry between producers. Agricultural production is generally more long industrial chain, such as pork production, from feed, veterinary drugs production and management, to pigs, piglets, fattening pigs feeding, to pig slaughter and processing, pork product sales, primarily through between the upstream and downstream enterprises market contract (commodity contracts) traded, low level of integration. Secondly, the same level of information between producers is asymmetrical. For producers, the pursuit of profit as much as possible is undoubtedly its most fundamental reason for the organization of production. To achieve this goal, especially among the producers with one of the industry is bound to exist between producers competition. In accordance with the principles of economics, and only when a producer through its own technology to upgrade or expand the production scale and other ways to make their own labor time socially necessary labor time is reduced to an average of less is it possible to obtain the residual value. Accordingly, each producer established in order to maintain their market share, and even open up each other's market share, it will hide their mutual production status. In order to reduce costs as much as possible, even at the quality of agricultural products in order to reduce the cost to reduce production costs, followed by reducing the production cost to lower sales prices, which occupy more market share. For master new techniques and methods as well as "closed-door policy", but also leave no stone unturned to steal each other's information so that in a competitive market in a favorable position. Therefore, the producers of agricultural products quality and safety information is asymmetric.
Fourth, governments and consumers the information asymmetry between. In general, the government departments to grasp more agricultural information, but difficult to quickly and effectively passed on to consumers, resulting in consumers lack the information to make the right choices.