为探究导致乳品安全问题的根源,分析奶农行为在外部情境变化中的演化,避免我国乳品安全问题的再次发生,文章研究了乳品行业上游原料奶供给环节奶农行为演进过程,建立了奶农个体行为的网络趋同性模型,针对政府食品安全监管缺失和监管健全两种情境,运用演化博弈理论分析了奶农群体行为的演化稳定均衡。研究表明:在政府部门对原料奶生产监管缺失的情境下,新加入奶农的生产行为会趋同于奶农网络的初始状态(即生产劣质原料奶),同时整个奶农网络上进行劣质生产是群体唯一的演化稳定策略;在政府部门对原料奶生产监管健全的情境下,奶农群体的唯一演化稳定策略是以一定概率采取优质生产策略,其值大小取决于奶农生产成本和政府监管力度等。最后,结合“三聚氰胺”事件进行了案例分析。
This paper researches the evolvement of dairy farmers' behaviors of the raw milk supply link in the dairy industry upstream, and builds the convergence model of the dairy farmers' network for the individual dairy farmer' behaviors. It analyses the evolutionarily stable equilibrium of the dairy farmers' group behaviors in two situations, one being that the supervision of the government on food safety is weak and the other one strong. The research shows that the new dairy farmers' behaviors would converge on the original state. Lastly, it makes the case analysis of the "Melamine" Event.