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   137197篇
  免费   3864篇
  国内免费   14篇
财政金融   25786篇
工业经济   11610篇
计划管理   21969篇
经济学   29547篇
综合类   1554篇
运输经济   969篇
旅游经济   2505篇
贸易经济   23635篇
农业经济   6214篇
经济概况   17027篇
信息产业经济   8篇
邮电经济   251篇
  2021年   846篇
  2020年   1629篇
  2019年   2385篇
  2018年   2348篇
  2017年   2537篇
  2016年   2719篇
  2015年   2105篇
  2014年   3418篇
  2013年   15321篇
  2012年   4224篇
  2011年   4187篇
  2010年   3752篇
  2009年   4348篇
  2008年   3958篇
  2007年   3305篇
  2006年   3614篇
  2005年   3622篇
  2004年   3139篇
  2003年   2925篇
  2002年   2877篇
  2001年   2670篇
  2000年   2586篇
  1999年   2467篇
  1998年   2337篇
  1997年   2368篇
  1996年   2226篇
  1995年   2025篇
  1994年   2026篇
  1993年   2010篇
  1992年   2075篇
  1991年   1972篇
  1990年   1854篇
  1989年   1702篇
  1988年   1635篇
  1987年   1633篇
  1986年   1712篇
  1985年   2498篇
  1984年   2366篇
  1983年   2182篇
  1982年   2022篇
  1981年   1975篇
  1980年   1925篇
  1979年   1862篇
  1978年   1650篇
  1977年   1626篇
  1976年   1393篇
  1975年   1279篇
  1974年   1194篇
  1973年   1187篇
  1972年   895篇
排序方式: 共有10000条查询结果,搜索用时 570 毫秒
181.
In this paper, we examine the warrant price and stock price reactions to the announcement of warrant life extensions by REITs. As predicted by option pricing theory, warrant prices increase in response to these extensions. The stocks of REITs making the extension announcements experience average abnormal returns that are not significantly different from zero. Thus, total firm value appears to increase, with the gains accruing primarily to the warrantholders.  相似文献   
182.
183.
Labour-market reforms in transition economies   总被引:1,自引:0,他引:1  
Several lessons can be drawn from the natural experiments ofcentral and eastern European countries with labour-market policies.Two of them are particularly relevant also for OECD countries.First, it is not wise to reduce the duration of unemploymentbenefits when the length of unemployment spells are on the rise,unless (I) unemployment is still low and there is the administrativecapacity to implement active labour-market policies on a widescale or (ii) there are income support schemes of the last resortin place and an administration capable of cost-effectively enforcingwork-tests for those falling off unemployment benefit compensationrolls. The second and perhaps more positive lesson in the lightof the above is that it is possible to transform institutionand create an efficient policy delivery mechanism within a shorttime span.  相似文献   
184.
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   
185.
186.
Abstract The research question in the present article can be phrased in the following way: what are the elements which influence the perception of the utility of information received from another function? A field study research has been conducted in 40 Belgian companies. In each company, we have studied two on-going innovation projects (one planning project, one development project). Crossfunctional communication behaviours at the R&D/marketing interface have been measured by means of mailed structured questionnaires. Three-hundred and eighty-six questionnaires have been returned. The data analyses show that there are four underlying information dimensions, i.e. the perceived relevance, the perceived comprehensibility, the perceived novelty and the perceived credibility of information. We also discuss some contingency variables (function of the message receiver, stage in the innovation process) that might moderate the impact of these dimensions. It will be shown that the interaction between source and receiver has a significant impact on the perceived credibility, the perceived comprehensibility and the perceived novelty of the received information.  相似文献   
187.
Negotiation support using the Graph Model for Conflict Resolution   总被引:1,自引:1,他引:0  
The Graph Model for Conflict Resolution is a flexible methodology for systematically studying strategic conflicts in the real world, and is therefore a natural tool for negotiation support. The basic definitions underlying the graph model are reviewed, and the techniques for analysis and interpretation are discussed. The modeling and analysis of a case study, an international trade negotiation concerning the export of Canadian softwood lumber to the United States, are used to demonstrate the practical application of the Graph Model for Conflict Resolution as a negotiation support tool. The modeling and analysis is carried out using the GMCR software system. The ability of the Graph Model for Conflict Resolution to provide insights and advice to negotiators is emphasized.  相似文献   
188.
189.
Consumers act out roles throughout their lives. Marketers assist in this role playing by providing the wardrobes, props, and sets in the form of products and services. They also help people understand acceptable role behavior by portraying roles in their communication programs. Consumers assume new roles as they age. This article is designed to enhance understanding of the often-ignored roles that accompany aging and provides examples of and suggestions for effective marketing for these role transitions.  相似文献   
190.
The paper extends Manning's model on education and balanced growth to include labour immigration. Each immigration unit is assumed to consist of one skilled worker and some unskilled members. The optimal immigration policy which maximizes the per capita steady-state consumption of the host country is derived. We show that optimal immigration policy can reduce the steady-state skilled labour ratio. More interesting still, contrary to the widespread belief that immigration of skilled workers hurts local skilled workers, it is the unskilled local workers whose interests are threatened by optimal immigration policy.  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