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   138948篇
  免费   3949篇
  国内免费   1篇
财政金融   26141篇
工业经济   11895篇
计划管理   22281篇
经济学   29766篇
综合类   1477篇
运输经济   993篇
旅游经济   2593篇
贸易经济   23996篇
农业经济   6307篇
经济概况   17202篇
信息产业经济   9篇
邮电经济   238篇
  2021年   847篇
  2020年   1662篇
  2019年   2449篇
  2018年   2366篇
  2017年   2551篇
  2016年   2761篇
  2015年   2146篇
  2014年   3480篇
  2013年   15781篇
  2012年   4313篇
  2011年   4273篇
  2010年   3784篇
  2009年   4420篇
  2008年   4007篇
  2007年   3366篇
  2006年   3717篇
  2005年   3671篇
  2004年   3220篇
  2003年   3016篇
  2002年   2967篇
  2001年   2703篇
  2000年   2610篇
  1999年   2500篇
  1998年   2367篇
  1997年   2411篇
  1996年   2252篇
  1995年   2037篇
  1994年   2036篇
  1993年   2028篇
  1992年   2060篇
  1991年   1960篇
  1990年   1840篇
  1989年   1712篇
  1988年   1639篇
  1987年   1627篇
  1986年   1717篇
  1985年   2497篇
  1984年   2360篇
  1983年   2156篇
  1982年   2037篇
  1981年   1949篇
  1980年   1907篇
  1979年   1860篇
  1978年   1654篇
  1977年   1653篇
  1976年   1408篇
  1975年   1294篇
  1974年   1230篇
  1973年   1197篇
  1972年   908篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
172.
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   
173.
A BSTRACT . In his The Construction of Social Reality , Searle presents an account of rights, responsibilities, obligations, duties, and similar entities in terms of the formula X counts as Y in context C , where " X " refers in the simplest case to some physical object or event and " Y " to the result of imposing upon X some deontic power or function. Smith attempts to show the limitations of this formula, focusing especially on the examples of contested property rights (where C is not uniquely defined), and of money in bank accounts and other phenomena (where no physical X -term is available). Searle responds to these criticisms, above all by pointing to the fact that some of the problems Smith raises are to be addressed not by an ontological analysis of social reality but rather through legal or political means.  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