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   134155篇
  免费   3814篇
  国内免费   1篇
财政金融   25364篇
工业经济   11513篇
计划管理   21401篇
经济学   28788篇
综合类   1442篇
运输经济   953篇
旅游经济   2480篇
贸易经济   23049篇
农业经济   6053篇
经济概况   16673篇
信息产业经济   7篇
邮电经济   247篇
  2021年   831篇
  2020年   1615篇
  2019年   2367篇
  2018年   2289篇
  2017年   2467篇
  2016年   2665篇
  2015年   2071篇
  2014年   3379篇
  2013年   15213篇
  2012年   4164篇
  2011年   4082篇
  2010年   3650篇
  2009年   4276篇
  2008年   3840篇
  2007年   3175篇
  2006年   3537篇
  2005年   3531篇
  2004年   3073篇
  2003年   2850篇
  2002年   2827篇
  2001年   2592篇
  2000年   2525篇
  1999年   2418篇
  1998年   2269篇
  1997年   2318篇
  1996年   2190篇
  1995年   1980篇
  1994年   1996篇
  1993年   1970篇
  1992年   2014篇
  1991年   1914篇
  1990年   1799篇
  1989年   1671篇
  1988年   1597篇
  1987年   1595篇
  1986年   1682篇
  1985年   2433篇
  1984年   2306篇
  1983年   2100篇
  1982年   1967篇
  1981年   1906篇
  1980年   1871篇
  1979年   1792篇
  1978年   1590篇
  1977年   1573篇
  1976年   1349篇
  1975年   1235篇
  1974年   1161篇
  1973年   1153篇
  1972年   864篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
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   
172.
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   
173.
174.
175.
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   
176.
177.
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   
178.
Objections to the teaching of business ethics   总被引:1,自引:0,他引:1  
  相似文献   
179.
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   
180.
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