英文文献：Technological Change In U.S. Agriculture: The Role Of Public And Private R&D-美国农业的技术变革:公共和私人研发的角色
英文文献作者：Tokgoz, Simla
英文文献摘要：
An endogenous growth model, in which technical change is attained through public and private R&D activities, is utilized to explore the role of technical change in TFP growth, to determine the impact of public and private agricultural R&D investments on the flow of agricultural patents, and to analyze the determinants of private agricultural R&D spending. The implications of the theoretical model are tested empirically for the U.S. agricultural sector. The empirical results are consistent with the theory. The main finding is that there is a positive relationship between TFP growth in the agricultural sector and agricultural patents. Current and past public and private R&D investments in agricultural sector have a significant and positive effect on agricultural patents. It is found that public R&D investment does not crowd out private R&D investment.

一个内生增长模型中,技术变革是通过公共和私人研发活动,达到利用探索技术变革TFP增长的作用,确定公共和私人农业研发投资的影响的农业专利,并分析私人农业研发支出的决定因素。该理论模型的含义在美国农业部门得到了实证检验。实证结果与理论一致。主要发现是，农业部门的全要素生产率增长与农业专利之间存在正相关关系。当前和过去在农业部门的公共和私人研发投资对农业专利具有显著的积极影响。研究发现，公共R&D投资并不会对私人R&D投资产生挤出效应。