临时收储政策对玉米生产技术效率的影响研究

文章采用超越对数形式的随机前沿生产函数测算了19个玉米主产省(区)的玉米生产技术效率,并利用双重差分模型检验临时收储政策对玉米生产技术效率的影响。研究发现:东北三省一区的玉米生产技术效率处于较高水平;南方丘陵和西南山地地区技术效率明显低于其他主产区。政策实施效果方面,临时收储政策对玉米生产技术效率有正向影响且这种正向影响不因时间的推移而逆转。因此,尽管临时收储政策会扭曲市场并增加财政负担,但是确实给农户提供了稳定的预期从而推动了技术效率的提高,随着玉米收储制度市场化改革进一步推进,应当避免政策改革中农户预期改变导致的技术效率损失。

Research on the Impact of Temporary Storage Policy on the Technical Efficiency of Corn Production

The paper adopts a stochastic frontier translog production function to measure the technical efficiency of corn production in 19 major corn producing provinces and regions,and uses difference-in-difference model to test the impact of temporary storage system on the technical efficiency of corn production.The study found that the technical efficiency of corn production in the three provinces and regions of northeast China is at a relatively high level;the technical efficiency of the southern hilly and southwestern mountainous regions is significantly lower than that of other major producing areas.In terms of the effect of policy implementation,the temporary storage system has a positive impact on the efficiency of corn production technology,and this positive impact doesn’t reverse with the passage of time.Therefore,although the temporary storage system may distort the market and increase the financial burden,it does provide farmers with stable expectations and promote the technical efficiency.With the further promotion of the mar ket-oriented reform of the corn purchase and storage system,we should avoid the loss of technical efficiency caused by the changes of farmers’expectations in the policy reform.