首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5057篇
  免费   255篇
财政金融   752篇
工业经济   270篇
计划管理   883篇
经济学   1368篇
综合类   53篇
运输经济   69篇
旅游经济   86篇
贸易经济   1180篇
农业经济   156篇
经济概况   488篇
邮电经济   7篇
  2024年   9篇
  2023年   93篇
  2022年   57篇
  2021年   85篇
  2020年   149篇
  2019年   160篇
  2018年   281篇
  2017年   362篇
  2016年   298篇
  2015年   178篇
  2014年   211篇
  2013年   807篇
  2012年   264篇
  2011年   258篇
  2010年   250篇
  2009年   229篇
  2008年   193篇
  2007年   150篇
  2006年   114篇
  2005年   134篇
  2004年   86篇
  2003年   114篇
  2002年   88篇
  2001年   66篇
  2000年   56篇
  1999年   49篇
  1998年   50篇
  1997年   44篇
  1996年   40篇
  1995年   20篇
  1994年   21篇
  1993年   21篇
  1992年   26篇
  1991年   22篇
  1990年   23篇
  1989年   20篇
  1987年   8篇
  1986年   12篇
  1985年   31篇
  1984年   32篇
  1983年   17篇
  1982年   22篇
  1981年   15篇
  1980年   16篇
  1979年   7篇
  1978年   8篇
  1977年   13篇
  1976年   7篇
  1975年   8篇
  1974年   10篇
排序方式: 共有5312条查询结果,搜索用时 15 毫秒
1.
I examine the effect of reform on telecom performance using a second-generation regulatory framework index and panel data techniques to test how regulatory governance affected sector performance in 22 Latin American countries during the period 1980–1997. Sound regulatory governance in telecommunications has a positive impact on network expansion and efficiency, in both the static and dynamic specifications. Openness of markets to competition and divestment of former state-owned telco operators also contributed positively to better sector performance. The dynamic specification shows that past performance has its own strong effect on present (and perhaps future) performance.  相似文献   
2.
The performance of service industries in Canada has been lower than that of good industries over the last four decades, with noticeable exceptions such as for railways and telecommunication carriers. Service industries were less economically (and technically) efficient in that they generated less output value (quantity) per hour worked (level and growth) or per combined unit of labour and capital (multifactor productivity growth) than good industries. The relative output price of services declined slightly over time compared with goods. At the disaggregated level, changing relative output prices were substantial and proved to be an important factor explaining the relative satisfactory economic performance of many service industries despite their low technical performance. Nevertheless, the output share of service industries increased over that period, sustained, mainly, by the growing recourse of all firms to outsourcing of services.  相似文献   
3.
Construction kits have played a significant part in nurturing the growth and development of the minds and manipulation-based skills of children (and adults) in formal and non-formal education settings. These kits have origins rooted in the representation of the built world and now have a diversity of form and function, including technical versions with moving parts. This article examines some of the historically based ideas that lie behind the role that kits may have in terms of physical modelling. The article traces the transformation of kits from simple bricks and blocks into more complicated pieces for space-filling and achieving the transfer of forces and motion. This transformation occurred during the Victorian era when the influence of the ideas of educationalists and, perhaps rather strangely, exponents of early aviation, played major roles in determining the diversity of forms of construction kit and modelled possibilities that are now to be seen in classrooms and homes. The article ends with a review of some of the lessons from the past and present that will need to be considered in relation to concrete modelling in schools for the future. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
4.
5.
This paper first examines the rapid growth and changing composition of manufactured exports in Indonesia and Thailand, highlighting the rapid growth of office and computer machinery and electric machinery, somewhat slower growth of non-electric and transportation machinery, as well as the low growth of previously large exports of textiles apparel. Second, the important contributions of foreign multinational enterprises (MNEs) to export growth in the machinery industries, particularly in electric, office, and computing machinery, are documented. Third, the paper describes trade policies in all these industries in some detail, emphasizing how low protection was a key facilitator of rapid export growth in the MNEs that dominated the electric, office, and computing machinery industry, while high protection reduced incentives to export among MNEs in the transportation machinery industry.  相似文献   
6.
The purpose of this paper is to analyze the impact of the Bank of Japan's official interventions on the JPY/USD parity during the period 1992–2004. The novelty of our approach is to combine two recent advances of the empirical literature on foreign exchange interventions: (i) drawing on over-the-counter option prices to characterize more precisely the distribution of market expectations; (ii) redefining interventions in terms of events as they tend to come in clusters. Moreover, in order to deal with the features of the data (small sample size, non-standard distribution), we use bootstrap tests.We show that interventions have a significant impact on the mean expectation (the forward rate). The results are more ambiguous for variance. Additionally, we find that the effect of interventions on skewness is significant, robust to different definitions of skewness, and consistent with the direction of interventions. On the contrary, our results clearly show that kurtosis is not affected by interventions. We finally show that: (i) coordination increases effectiveness of interventions; (ii) results are not altered when controlling for other economic and political news.  相似文献   
7.
In July 2006, the European Union's (EU) Common Market Organization (CMO) for sugar underwent the first radical reform since its establishment in 1968. In this article, we study the incentives for adoption of new technologies before and after the policy reform. We build a stochastic partial equilibrium model and use it to analyze the effect of the policy reform on the adoption incentives of genetically modified herbicide tolerant sugar beet. Our findings show that the adoption incentives of high‐cost sugar beet farmers are significantly reduced under the new CMO. Medium‐cost producers, in contrast, have greater incentives to adopt new technologies, while low‐cost producers are largely left unaffected. The reduced adoption incentives of high‐cost farmers lead to lower flexibility and competitiveness of these farmers and therefore coincides with the goals of the reform to crowd out high‐cost producers and increase competitiveness of the European sugar market. En juillet 2006, l'Organisation commune du marché (OCM) du sucre a subi sa première réforme radicale depuis sa mise en place par l'UE en 1968. Dans la présente étude, nous avons examiné les incitatifs offerts pour l'adoption de nouvelles technologies, avant et après la réforme. Nous avons élaboré un modèle stochastique d'équilibre partiel et l'avons utilisé pour analyser les répercussions de la réforme sur les incitatifs offerts pour l'adoption de variétés de betteraves sucrières génétiquement modifiées résistantes aux herbicides. Selon nos résultats, les incitatifs offerts aux producteurs de betterave sucrière ayant des coûts marginaux élevés ont significativement diminué depuis la réforme de l'OCM du sucre. Par contre, les incitatifs offerts aux producteurs ayant des coûts marginaux moyens se sont accrus, tandis que ceux offerts aux producteurs ayant de faibles coûts marginaux n'ont pas changé. La diminution des incitatifs offerts aux producteurs ayant des coûts marginaux élevés entraîne une diminution de la souplesse et de la capacité concurrentielle de ces producteurs et, par conséquent, coïncide avec les objectifs de la réforme qui visent àévincer les producteurs ayant des coûts marginaux élevés et à accroître la capacité concurrentielle du marché européen du sucre.  相似文献   
8.
The Internet has successfully generated an ever-expanding cohort of users for all its major concomitant activities, including information gathering, communications and transactions. So far no attempt has been made to validate whether such a success is so deep as to transcend national cultures. Nor any work has been conducted to compare the internationalisation1 performances between online usage activities. The current study addresses these two research gaps from the perspective of four countries, i.e. Britain, Germany, Japan and Taiwan. Results show that although the technological forces have been quite successful in internationalising overall online usage activities, they succumb to the cultural forces as far as only the transactions activity, or more colloquially online purchase, is concerned. This indicates the relative difficulty in internationalising online purchase vis-à-vis other online usage activities. Further research on locating a series of step functions or kick-off time points regarding the development of online purchase is suggested.  相似文献   
9.
This paper is interested in the modelling of the relationship between active and passive labour market policies and the aggregate unemployment outflow rate. Our model is based on a matching function and includes a simple representation of the competition between various groups of job searchers. The empirical analysis uses Belgian data. Faced with variables that are often integrated of order 1 according to the usual tests but which cannot strictly speaking be integrated, we contribute to an important methodological debate by comparing the conclusions of a classical econometric analysis and a cointegration approach.  相似文献   
10.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号