英文文献：Analysing Competition Between Seed Varieties: An Application To Hybrid Corn Seed In France-种子品种间竞争分析:在法国杂交玉米种子上的应用
英文文献作者：Alfranca, Oscar,Lemarie, Stephane
英文文献摘要：
This paper analyses the determinant of the sales the seed varieties sold the French corn market. The analysis is based on a model of differentiated product. The results show that the effect of the yield estimated by the extension services is positive and significant.

本文分析了法国玉米种子品种销售的决定因素。分析基于差异化产品模型。结果表明，推广服务对预估产量的影响是显著的。