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   36510篇
  免费   513篇
  国内免费   1篇
财政金融   6507篇
工业经济   2359篇
计划管理   5731篇
经济学   8297篇
综合类   732篇
运输经济   137篇
旅游经济   290篇
贸易经济   7953篇
农业经济   895篇
经济概况   3498篇
信息产业经济   46篇
邮电经济   579篇
  2021年   128篇
  2020年   220篇
  2019年   311篇
  2018年   2660篇
  2017年   2413篇
  2016年   1603篇
  2015年   354篇
  2014年   472篇
  2013年   2041篇
  2012年   1010篇
  2011年   2588篇
  2010年   2316篇
  2009年   2120篇
  2008年   2053篇
  2007年   2427篇
  2006年   617篇
  2005年   858篇
  2004年   946篇
  2003年   1047篇
  2002年   726篇
  2001年   452篇
  2000年   466篇
  1999年   357篇
  1998年   395篇
  1997年   356篇
  1996年   364篇
  1995年   312篇
  1994年   318篇
  1993年   315篇
  1992年   357篇
  1991年   319篇
  1990年   268篇
  1989年   235篇
  1988年   221篇
  1987年   276篇
  1986年   275篇
  1985年   399篇
  1984年   395篇
  1983年   394篇
  1982年   311篇
  1981年   324篇
  1980年   302篇
  1979年   318篇
  1978年   232篇
  1977年   238篇
  1976年   186篇
  1975年   194篇
  1974年   134篇
  1973年   151篇
  1971年   102篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
91.
Using a sample of Australian Multi-sector trusts we examine selectivity and market timing performance and extend the analysis to include the relatively new measure of volatility timing. This is of particular relevance to our data set, as high levels of volatility persistence are prevalent in Australia. In addition we consider the stability, asymmetry and seasonality of the various performance and risk measures. A survivorship adjustment procedure is also employed in order to assess the impact of survivorship on selectivity, market timing and volatility timing performance.  相似文献   
92.
This article specifies what an optimal pollution tax should be when dealing with a vertical Cournot oligopoly. Polluting firms sell final goods to consumers and outsource their abatement activities to an environment industry. It is assumed that both markets are imperfectly competitive. Thus, the tax is a single instrument used to regulate three sorts of distortions, one negative externality and two restrictions in production. Consequently, the optimal tax rate is the result of a trade-off that depends on the firms’ market power along the vertical structure. A detailed analysis of Cournot-Nash equilibria in both markets is also performed. In this context, the efficiency of abatement activities plays a key-role. It gives a new understanding to the necessary conditions for the emergence of an eco-industrial sector.   相似文献   
93.
Summary  Competition authorities are increasingly measuring the effects of their enforcement actions, seeking a robust justification for the proliferation of competition policy. We highlight the importance of identifying the right counterfactual against which to measure effects, and set out the relevant categories of costs and benefits. We then explore how a balance can be struck between the benefits and inherent limitations of these measurement exercises. Relatively crude analyses of cartel action benefits can be sufficient to achieve public legitimacy for competition policy. Assessing the effects of merger and conduct inquiries is often ambiguous, but could be used to improve decision-making processes. Director and Managing Consultant, respectively, at Oxera, Oxford and London. The valuable comments of Fod Barnes, Kerry Hughes and an anonymous referee are gratefully acknowledged. The opinions expressed in this article are those of the authors alone.  相似文献   
94.
95.
96.
97.
We employ panel data as well as country-specific models to uncover empirically the determinants of current account imbalances. We find evidence of slope heterogeneity likely rendering the fixed-effect estimator inconsistent. Mean group estimation is followed to overcome the latter difficulty. Both estimation techniques are evaluated by means of in- and out-of-sample criteria. The mean group estimator outperforms the fixed-effect approach and, moreover, only three economic variables are found to impact on the current account balance significantly. These are the government budget balance, the domestic output gap and the changes of the terms of trade. We finally propose a parsimonious dynamic model of the current account, including only these variables and illustrate that it has similar predictive accuracy as country-specific benchmark models. JEL no. F32, C23, C53  相似文献   
98.
回顾1.需求7月份,世界主要经济体跌幅趋缓,显现经济复苏迹象。中国经济更是率先走出低迷,增长提速,第二季度国内生产总值同比增长7.9%。基础设施投资起到了决定性的作用。7月份固定资产投资延续上半年的趋  相似文献   
99.
100.
A survey conducted in Mississippi, Texas, Indiana, and Nebraska elicited producers' preferences for various farm policy changes. This permitted examination of the diversity of preferences that single-state studies have not allowed. Five policy choices, including deficiency payments, loan programs, crop insurance, export programs, and disaster payments were examined. Logit model results predicting producer preferences for each of the five dichotomous policy choices are reported. Explanatory variables based on expected utility theory such as risk aversion, price and yield variability, and price–yield correlation are significant in various models.  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