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   134972篇
  免费   3834篇
  国内免费   1篇
财政金融   25528篇
工业经济   11538篇
计划管理   21538篇
经济学   28872篇
综合类   1439篇
运输经济   957篇
旅游经济   2494篇
贸易经济   23332篇
农业经济   6051篇
经济概况   16795篇
信息产业经济   8篇
邮电经济   255篇
  2021年   831篇
  2020年   1617篇
  2019年   2370篇
  2018年   2280篇
  2017年   2455篇
  2016年   2669篇
  2015年   2080篇
  2014年   3394篇
  2013年   15264篇
  2012年   4168篇
  2011年   4088篇
  2010年   3656篇
  2009年   4289篇
  2008年   3837篇
  2007年   3187篇
  2006年   3547篇
  2005年   3535篇
  2004年   3094篇
  2003年   2852篇
  2002年   2833篇
  2001年   2618篇
  2000年   2544篇
  1999年   2444篇
  1998年   2279篇
  1997年   2330篇
  1996年   2183篇
  1995年   1994篇
  1994年   2016篇
  1993年   1966篇
  1992年   2040篇
  1991年   1938篇
  1990年   1812篇
  1989年   1678篇
  1988年   1590篇
  1987年   1606篇
  1986年   1683篇
  1985年   2451篇
  1984年   2298篇
  1983年   2125篇
  1982年   1974篇
  1981年   1919篇
  1980年   1876篇
  1979年   1810篇
  1978年   1632篇
  1977年   1626篇
  1976年   1389篇
  1975年   1273篇
  1974年   1184篇
  1973年   1184篇
  1972年   896篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
In rational, efficiently functioning and complete markets, returns on derivative and underlying securities should be perfectly contemporaneously correlated. Due to market imperfections, one of these markets may reflect information faster. The use of high-frequency data and the choice for a small unit time interval to measure these lead-lag relations comes at the cost of some or many missing observations, causing traditional estimators to either under- or overestimate covariances and correlations. We use a new estimator to estimate lead-lag relationships between the cash AEX index, options and futures. We find that futures returns lead both options and cash index returns by approximately 10 minutes. The relationship between options and the cash market is not completely unidirectional.  相似文献   
172.
173.
174.
Despite the prevalence of elective business ethics courses, little research has sought to explain and predict why some students enroll in these courses and while others do not. Using the theory of planned behavior (Ajzen and Madden, 1986) as a theoretical foundation, 178 graduate students in Ireland were surveyed about their intention to sign up for an elective ethics class. Their behavior was measured two months later. The results reveal the power of the theory of planned behavior to explain and predict who takes elective ethics classes.Donna M. Randall is an associate professor and chair in the Department of Management and Systems at Washington State University. Her research interests include business ethics, organizational commitment, and reproductive risk in the work place. Her work has appeared inJournal of Business Ethics, Decision Sciences, Academy of Management Review, Journal of Vocational Behavior, Journal of Business Research, and others.  相似文献   
175.
176.
In this paper we will analyze the relationship between the value and duration moments of a cash flow and movements in the yield curve. We will show that for changes in the yield curve which can be related to tn , the 1st order changes in the net present value of a cash flow are linearly dependent on the n + lth duration moments, and that the 2nd order changes are dependent on the sum of duration moments of order 2 n + 1 and 2 n + 2. We will use this relationship to tilt tracking portfolios so as to protect them against specific changes in the yield curve.  相似文献   
177.
Objections to the teaching of business ethics   总被引:1,自引:0,他引:1  
  相似文献   
178.
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   
179.
180.
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   
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