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   140789篇
  免费   3917篇
  国内免费   9篇
财政金融   26379篇
工业经济   11775篇
计划管理   22756篇
经济学   30448篇
综合类   1690篇
运输经济   983篇
旅游经济   2528篇
贸易经济   24052篇
农业经济   6332篇
经济概况   17473篇
信息产业经济   7篇
邮电经济   292篇
  2021年   907篇
  2020年   1703篇
  2019年   2432篇
  2018年   2430篇
  2017年   2608篇
  2016年   2768篇
  2015年   2159篇
  2014年   3494篇
  2013年   15472篇
  2012年   4432篇
  2011年   4476篇
  2010年   3993篇
  2009年   4506篇
  2008年   4177篇
  2007年   3501篇
  2006年   3785篇
  2005年   3768篇
  2004年   3268篇
  2003年   3020篇
  2002年   2966篇
  2001年   2761篇
  2000年   2650篇
  1999年   2519篇
  1998年   2391篇
  1997年   2392篇
  1996年   2279篇
  1995年   2070篇
  1994年   2099篇
  1993年   2072篇
  1992年   2113篇
  1991年   2026篇
  1990年   1891篇
  1989年   1717篇
  1988年   1654篇
  1987年   1659篇
  1986年   1744篇
  1985年   2510篇
  1984年   2399篇
  1983年   2204篇
  1982年   2062篇
  1981年   1979篇
  1980年   1949篇
  1979年   1878篇
  1978年   1679篇
  1977年   1639篇
  1976年   1395篇
  1975年   1297篇
  1974年   1192篇
  1973年   1191篇
  1972年   903篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
171.
172.
173.
We examine the importance of Roosevelt’s “relief, recovery, and reform” motives to the distribution of New Deal funds across over 3000 US counties, program by program. The major relief programs most closely followed Roosevelt’s three Rs. Other programs were tilted more in favor of areas with higher incomes. For all programs spending for political advantage in upcoming elections was a significant factor. Roosevelt’s successful reelections were based on developing specific programs for a broad range of constituents, delivering on his stated goals, but also spending more at the margin for political purposes.  相似文献   
174.
Using the agency and institutional perspectives, this study advances several hypotheses about the board structure–firm performance relationship within Russia. We tested these hypotheses using survey data. Despite a relatively small sample size, predictions from both theoretical perspectives were supported. Specifically, we found a negative relationship between “informal” CEO duality and firm performance. This finding is noteworthy given the 1996 Russian Federal law which prohibits the CEO from also serving as board chair. Also, we found that the more vigorously the firm pursues a retrenchment strategy, the more negative the relationship between proportion of inside directors and firm performance. Overall, these findings suggest that effective corporate governance may be essential to firm performance in Russia.  相似文献   
175.
This paper explores differences in the bidding patterns of entrants and incumbents in road construction auctions. We find that entrants bid more aggressively and win auctions with significantly lower bids than incumbents. The differences in their bidding patterns are consistent with a model of auctions in which the distribution of an entrant's costs exhibits greater dispersion than that of an incumbent's and relations of stochastic dominance in the distributions do not persist for the entire range of estimated costs. We also find that more efficient firms bid, on average, more aggressively and firms with greater backlogs bid less aggressively.  相似文献   
176.
One Pleistocene mystery is why early North Americans eradicated their large, potentially domesticable animals (e.g., horses), whereas early Europeans did not. A commonly‐held hypothesis is that European species were evasive due to co‐evolution with hominids, whereas North American animals were naïve and unable to adapt quickly enough when experienced human hunters arrived from Eurasia. We explore this hypothesis with a paleoeconomic model of co‐evolution that integrates human hunting investments and wildlife population responses. We find that investments in hunting ability, based on the relative scarcity of prey species, could have mattered more than wildlife ‘naivety’ in explaining the extinction.  相似文献   
177.
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   
178.
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   
179.
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