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   35318篇
  免费   519篇
  国内免费   1篇
财政金融   6493篇
工业经济   2093篇
计划管理   5577篇
经济学   7957篇
综合类   658篇
运输经济   122篇
旅游经济   483篇
贸易经济   7406篇
农业经济   845篇
经济概况   3523篇
信息产业经济   45篇
邮电经济   636篇
  2021年   124篇
  2020年   254篇
  2019年   416篇
  2018年   2745篇
  2017年   2545篇
  2016年   1664篇
  2015年   364篇
  2014年   527篇
  2013年   1968篇
  2012年   968篇
  2011年   2485篇
  2010年   2253篇
  2009年   2023篇
  2008年   1944篇
  2007年   2295篇
  2006年   460篇
  2005年   743篇
  2004年   821篇
  2003年   962篇
  2002年   601篇
  2001年   406篇
  2000年   431篇
  1999年   332篇
  1998年   344篇
  1997年   339篇
  1996年   338篇
  1995年   313篇
  1994年   325篇
  1993年   310篇
  1992年   340篇
  1991年   357篇
  1990年   280篇
  1989年   224篇
  1988年   247篇
  1987年   223篇
  1986年   268篇
  1985年   356篇
  1984年   340篇
  1983年   300篇
  1982年   310篇
  1981年   333篇
  1980年   285篇
  1979年   288篇
  1978年   255篇
  1977年   188篇
  1976年   188篇
  1975年   196篇
  1974年   143篇
  1973年   166篇
  1972年   122篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
R.Q. Doeswijk 《De Economist》1997,145(4):573-598
The efficient markets hypothesis states that at any times security prices fully reflect all available information. Contrarian investment strategies do not recognize the efficiency of capital markets. They call for buying undervalued stocks, i.e. stocks with a low price relative to their fundamentals. The idea behind such a strategy is to take advantage of the extrapolation behaviour of naive investors. Using a fresh and extensive data set from the Dutch stock market, we found that these strategies yield an outperformance without a higher risk. Our results make it hard to maintain the efficient market hypothesis.  相似文献   
82.
Futures research includes the problem of generating reasonably exhaustive and plausible scenarios for a given topic, a problem for which there are no truly satisfactory solutions. This article reviews and evaluates a method, field anomaly relaxation, first put forward some 20 years ago. The evaluation is in the context of an illustrative study of political developments in Europe. The research reconstructs and further develops the method and concludes that it has something to offer for scenario generation. Its weaknesses are identified and suggestions for further research are made.  相似文献   
83.
A number of simulation studies claim to have solved the Feldstein–Horioka puzzle by demonstrating that a high time-series correlation between saving and investment naturally arises from business cycle shocks. This paper uses panel data of saving and investment controlled for business cycle shocks to empirically test the significance of cyclical shocks — productivity, fiscal and the terms of trade shocks — in explaining a high saving–investment correlation. The estimation results reveal that conventional aggregate shocks only partially explain the high saving–investment correlation. Moreover, country differences in the size of the GNP and the non-traded sector do not significantly affect the saving–investment correlation. The saving–investment correlation puzzle remains a puzzle after all.  相似文献   
84.
85.
This paper considers the impact of Programa de Educación, Salud y Alimentación ( PROGRESA ), a large Mexican rural anti-poverty programme that had an evaluation sample in which overall treatment was randomly assigned to some communities but not others, on child nutrition. When we examine the impact of PROGRESA based on the presumption of randomized allocations, we find that PROGRESA had no or even a negative impact on child nutrition. However, not all children designated to receive nutritional supplements actually did so. Our preferred estimates – child fixed-effects estimates that control for unobserved heterogeneity that is correlated with access to the supplement – indicate a significantly positive and fairly substantial programme effect of the nutritional supplements on children 12–36 months. They imply an increase of about a sixth in mean growth per year for these children and a lower probability of stunting. Effects are somewhat larger for children from poorer communities but whose mothers are functionally literate. The long-term consequences of these improvements are non-trivial; its impact working through adult height alone could result in a 2.9% increase in lifetime earnings.  相似文献   
86.
The Australian hospital industry is described and it is noted that the term ‘hospital’ is applied to a wide range of institutions. The main problems and issues associated with hospitals are discussed, including the lack of adequate methods of measuring their ‘products’ and of allocating funds to them. The role of the medical staff in influencing the ‘demand’ for hospital beds and in resource allocation is emphasised as a major influence on hospital behaviour. In a study of the determinants of the costs of Victorian public hospitals it was found that the complexity of the case-mix as measured by diagnosis related groups (DRGs) was a major determinant of teaching hospital costs but not of those of other large hospitals. DRG-based funding and costing of hospitals is recommended as a strategy for achieving increased efficiency.  相似文献   
87.
88.
The paper highlights the main drivers for merger policy reform in the European Union, including the consequences of the recent appeal court reverses. It discusses some of the substantive and procedural issues that the reform package should address, and outlines the reforms in progress. The author concludes that much of the reform package will be beneficial, but some important opportunities have been missed in this inevitably patchwork process.  相似文献   
89.
While folklore in finance holds that split valuation effectsare due to dividend increases associated with splits, littleis known about magnitudes of dividend and nondividend componentsof split announcement effects. We find that splits and dividendsare indeed informational substitutes, a notion we characterizemore precisely, but a significant portion of split valuationeffects, 46% according to our estimates, cannot be attributedto dividend information in splits. Our techniques extend theliterature on conditional event-study methods and we illustratetheir practical value in testing hypotheses and analyzing datanot amenable to analysis by standard procedures.  相似文献   
90.
东北亚能源合作的期待效果与中国的作用   总被引:1,自引:0,他引:1  
20世纪80、90年代一度稳定的国际石油价格,自2004年起呈上升趋势,维持了历史上最高纪录。国际油价以迪拜油为基准,2003年每桶平均26.8美元,而2004年高达33.64美元,比上年增长25.6%,直至2005年第三季度为止平均价格比2004年增长了64.8%。国际油价的暴涨源于中东产油国的动荡不安,储蓄及美元贬值而引起的投机资金大量地流入世界石油市场及由台风引起的美国石油设施的破坏等因素。固然存在这些原因,但是,最根本的原因还在于世界石油市场供给不足,即目前世界石油生产及炼油能力还属于停滞阶段,但对石油的需要却在暴涨。这种供给不足的情况短期内…  相似文献   
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