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专利对企业报酬生产率的作用效应估计与分解 被引量:1
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作者 陈志远 《计量经济学报》 CSSCI CSCD 2023年第1期166-194,共29页
本文拓展了已有的生产率估计方法,构建了一个包含内生生产率变化的计量框架来评估专利对报酬生产率的作用效应.该估计方法直接考虑了专利与研发投入对企业生产率的的影响,从而避免了常见的假定生产率是外生变动而导致的生产函数的估计偏... 本文拓展了已有的生产率估计方法,构建了一个包含内生生产率变化的计量框架来评估专利对报酬生产率的作用效应.该估计方法直接考虑了专利与研发投入对企业生产率的的影响,从而避免了常见的假定生产率是外生变动而导致的生产函数的估计偏误.为了深入探讨专利对生产率的作用机制,本文将专利对生产率的作用效应分解为垄断效应和规模效应.本文提出的估计框架可以广泛适用于评估和检验专利对报酬生产率的作用效应与作用机制.基于中国医药制造业2001–2007年的企业数据和专利数据的合并数据,本文考察了专利对于生产率的作用效应与机制.实证结果发现:第一,仅有滞后一期的发明专利对于未来的报酬生产率有显著的促进效应;第二,专利对报酬生产率的作用主要体现为物质生产率提高所带来的规模效应而非垄断效应.最后,本文进行了三方面的拓展研究并发现:专利补贴政策未能改善专利对报酬生产率的作用结果,专利审查能够有效地识别高质量的专利,私人企业的发明专利相对于非私人企业能够更显著地促进报酬生产率的提升. 展开更多
关键词 专利 报酬生产率 物质生产率 垄断效应 规模效应 生产函数估计
原文传递
Analysis of Labour-Use Patterns among Small-Holder Cocoa Farmers in South Western Nigeria
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作者 Kassim Adekunle Akanni Alfred Olayinka Dada 《Journal of Agricultural Science and Technology(B)》 2012年第1期107-113,共7页
Labour is generally in short supply in peasant production particularly in the rural areas in Nigeria. There is also an unpredictable pattern of use of labour in cocoa farms. This has a negative implication on the leve... Labour is generally in short supply in peasant production particularly in the rural areas in Nigeria. There is also an unpredictable pattern of use of labour in cocoa farms. This has a negative implication on the level and quality of farm output among small holder farmers. The study investigated the effects of labour use patterns on productivity of cocoa farms in south western Nigeria. Multi-stage random sampling technique was used to select the respondents and the data were analyzed with the use of descriptive statistics and stochastic efficiency frontier function. Many farms (80%) were less than 5 hectares in size and sharecropping was the most dominant of the labour types on the farms. Adult male labour constituted about 69% of the total labour- use on the plantations and the majority of the labour was involved in the application of agrochemicals and harvesting of cocoa pods. The quantity of harvested cocoa beans, size of cleared understoreys and quantity of applied agrochemicals significantly affected (at 5% level) the labour-use efficiency in cocoa plantations. Poor remunerations often discourage prospective farm labour from participating in cocoa production. Better farm labour supply level could be achieved if the remuneration for farm labour is handsomely increased. 展开更多
关键词 Farm labour PRODUCTIVITY cocoa farms efficiency sharecropper.
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