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1.
This is the first study to document evidence of technical trading effectiveness at firm level in the Chinese A-share market by investigating the relationship between excess profits of technical trading rules and firm-specific characteristics. Our results reveal that firms with higher excess profits from technical trading have more noise traders and higher institutional ownership and that those firms tend to be growth firms with lower liquidity and higher firm-specific uncertainty. Further analysis shows that the profitability of technical trading rules is unsustainable and the excess profits of the highest technical trading profit quintile portfolio disappear in the following year. 相似文献
2.
This paper compares the approximation capabilities of the minflex-Laurents translog and minflex generalized Leontief cost functions with their translog and generalized Leontief counterparts in Monte Carlo experiments. The minflex Laurent specifications generally provided closer approximations to underlying technical and economic parameters. Imposition of nonlinear restrictions on some of the parameters of the minflex Laurent models yielded measurable improvement in estimated elasticities of substitutions, returns to scale, and rates of technical change.The refereeing process of this paper was handled through E. Appelbaum. 相似文献
3.
Andrew Barnes 《Journal of Agricultural Economics》2008,59(2):370-376
Within the UK there has been a lack of studies of technical efficiency at the Scottish level. This note compares the results obtained using Scottish data with a recent study by Hadley [Journal of Agricultural Economics (2006) Vol. 57, pp. 81–100] for English and Welsh farms. Four major sectors are investigated, namely: (i) cereals, (ii) dairy, (iii) sheep and (iv) beef over the period 1989 to 2004. Some distinct differences in efficiencies, returns to scale and causes of efficiency are found. 相似文献
4.
5.
Richard Nehring Charles Barnard David Banker Vince Breneman 《American journal of agricultural economics》2006,88(4):930-946
This article determines the relative technical efficiency of rural- and urban-influenced crop/livestock enterprises in the Corn Belt. Farmers in urban-influenced locations are less technically efficient than farmers in rural locations. During 1998–2000, stochastic production frontier procedures indicate that a 10% increase in urban influence leads to a close to 4% decrease in technical efficiency. The most successful urban-influenced farms have controlled costs as effectively as rural farms. They have tended to de-emphasize that nondairy livestock activities—particularly beef and hogs—do not rely extensively on off-farm income, and have relatively large, less residential/lifestyle operations compared to less successful urban-influenced farmers. However, our statistical analysis clearly bears out the refrain in popular literature that urban proximity raises the cost for, and decreases the viability of, traditional farms. 相似文献
6.
国际贸易中的技术性壁垒及我国对策 总被引:1,自引:0,他引:1
李涛 《中国国土资源经济》2003,16(4):32-35
二十一世纪是全球经济一体化的知识时代 ,科学的巨大变革已经渗透于人类社会的方方面面 ,而国际贸易中的技术性壁垒则体现了贸易保护主义与科技相结合的作用。并且 ,这种非关税壁垒形式以其正义的外衣、巨大的影响力和借助科技的快速发展越来越成为国际贸易中不可忽视的保护手段。中国作为世界贸易组织的新成员更应在这方面进行研究 ,并制定相应的战略。 相似文献
7.
马铃薯在中国传播的技术及社会经济分析 总被引:1,自引:0,他引:1
本文从生物、技术及社会经济的角度考证马铃薯在中国传播的过程,重点对传播条件和传播障碍进行阐述,分析了20世纪中国的社会变迁和科技进步对马铃薯传播的影响,并进一步讨论马铃薯扩种对我国粮食生产和社会生活的作用。 相似文献
8.
Guojie Zhao Gang Lu 《美中经济评论(英文版)》2005,4(9):31-34
Technical advancement includes technology generation, diffusion and aggregation. This paper focuses on researching the mechanism of technology generation from the viewpoint of technology cycle, and the source spring of the generation of the innovation based on technology is scientific discovery. The technical perfection and secondary innovation are determined by the pulling force of demand, unbalanced inducement mechanism and profit. Standardized innovation is the sign of technology mature stage, the limit in demand and supply of technology drives the technical innovation into lag phase. 相似文献
9.
文章详细介绍了青藏铁路施工对环境保护的影响,指出了强化青藏铁路环境保护工作的意义,提出了青藏铁路环境保护工作的主要内容和应当采取的措施,阐述了将青藏铁路真正建成21世纪的世界屋脊的环保型铁路的实施要点。 相似文献
10.
就《技术制图与机械制图》中的几个“通用术语”,如投影与视图、轴测投影与轴测图等,从原理上发表自己的一些看法,提出修改意见,指出了该标准中的一些不足之处。 相似文献