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   138799篇
  免费   3978篇
  国内免费   1篇
财政金融   26068篇
工业经济   11657篇
计划管理   22268篇
经济学   30281篇
综合类   1479篇
运输经济   1008篇
旅游经济   2524篇
贸易经济   23913篇
农业经济   6202篇
经济概况   17114篇
信息产业经济   8篇
邮电经济   256篇
  2021年   871篇
  2020年   1698篇
  2019年   2475篇
  2018年   2517篇
  2017年   2726篇
  2016年   2856篇
  2015年   2179篇
  2014年   3501篇
  2013年   15710篇
  2012年   4318篇
  2011年   4309篇
  2010年   3838篇
  2009年   4429篇
  2008年   4006篇
  2007年   3322篇
  2006年   3622篇
  2005年   3601篇
  2004年   3137篇
  2003年   2921篇
  2002年   2860篇
  2001年   2709篇
  2000年   2605篇
  1999年   2502篇
  1998年   2372篇
  1997年   2397篇
  1996年   2273篇
  1995年   2062篇
  1994年   2053篇
  1993年   2009篇
  1992年   2068篇
  1991年   1995篇
  1990年   1871篇
  1989年   1692篇
  1988年   1626篇
  1987年   1639篇
  1986年   1716篇
  1985年   2480篇
  1984年   2357篇
  1983年   2154篇
  1982年   2011篇
  1981年   1947篇
  1980年   1911篇
  1979年   1845篇
  1978年   1645篇
  1977年   1628篇
  1976年   1392篇
  1975年   1279篇
  1974年   1189篇
  1973年   1188篇
  1972年   897篇
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
181.
While the dynamic theory of production provides little insight towards identifying a specific functional form for the firm's technology, dynamic production analysis has been explored traditionally in a parametric framework. A nonparametric dynamic dual cost approach to production analysis is developed in this article. Recovering technological information from intertemporal cost minimizing behavior is possible without imposing a parametric functional form on the firm's technology. Nonparametric tests to analyze the structure of a dynamic technology are presented from a dynamic cost minimizing perspective. The empirical implementation of these tests is illustrated for a balanced panel data set of Pennsylvania dairy operators during the time period 1986–1992.  相似文献   
182.
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   
183.
184.
185.
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   
186.
187.
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   
188.
Objections to the teaching of business ethics   总被引:1,自引:0,他引:1  
  相似文献   
189.
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   
190.
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