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   8321篇
  免费   254篇
财政金融   1757篇
工业经济   711篇
计划管理   1332篇
经济学   1750篇
综合类   110篇
运输经济   94篇
旅游经济   162篇
贸易经济   1757篇
农业经济   245篇
经济概况   585篇
信息产业经济   4篇
邮电经济   68篇
  2023年   57篇
  2022年   47篇
  2021年   80篇
  2020年   121篇
  2019年   195篇
  2018年   218篇
  2017年   245篇
  2016年   214篇
  2015年   176篇
  2014年   277篇
  2013年   959篇
  2012年   312篇
  2011年   357篇
  2010年   323篇
  2009年   364篇
  2008年   325篇
  2007年   278篇
  2006年   253篇
  2005年   284篇
  2004年   236篇
  2003年   243篇
  2002年   234篇
  2001年   196篇
  2000年   175篇
  1999年   177篇
  1998年   144篇
  1997年   154篇
  1996年   126篇
  1995年   123篇
  1994年   124篇
  1993年   113篇
  1992年   111篇
  1991年   97篇
  1990年   67篇
  1989年   74篇
  1988年   68篇
  1987年   67篇
  1986年   68篇
  1985年   114篇
  1984年   90篇
  1983年   81篇
  1982年   90篇
  1981年   65篇
  1980年   73篇
  1979年   66篇
  1978年   57篇
  1977年   60篇
  1976年   55篇
  1974年   31篇
  1973年   20篇
排序方式: 共有8575条查询结果,搜索用时 15 毫秒
81.
82.
If future demand for maize in Latin America and the Caribbean region (LAC) is to be met from local sources, domestic production must continue to increase. Because further expansion in the area planted to maize is precluded by the limited availability of arable land, future increases in production will have to rely heavily on the spread of productivity‐enhancing hybrid technology. Until now, the diffusion of hybrid maize in LAC has been quite variable. Using data from 18 countries, we investigate factors affecting the hybrid maize diffusion rate. Our findings validate conventional profitability‐based explanations of producer adoption behavior, but they also confirm the importance of supply‐side factors, thereby providing empirical support for the life cycle theory of seed industry development. We conclude that if policy makers in LAC are to accelerate the diffusion of hybrid maize, they will have to ensure an environment in which it is not only profitable for producers to adopt improved germplasm, but also profitable for the seed industry to produce and sell high‐quality seed.  相似文献   
83.
This paper develops an identification strategy to generate unbiased estimates of Internet usage spillovers using a unique data set of US households. This strategy addresses the effects of variables that affect consumers' decisions but are unobservable to the researcher that lead to biased estimates. The estimator developed here examines changes in household behavior over time and uses county level instrumental variables for county level spillover measures.Multiple potential sources of learning are identified including those from the household's locality, from educational Internet subsidies, and from universities. There is general support for all sources, but the locality and subsidy results are both more robust and larger. These findings directly address the policy relevance of these spillover sources and they have implications for policies to encourage Internet use as well as for identification strategies for the effects of the Internet on behavior.  相似文献   
84.
The purpose of this paper is to assess the main aspects involved in the competitiveness of manufacturing industries in the Euro zone area (EZ-12). To this end, we apply the generalized method of moments to a panel data error correction model. Our sample spans the period from 1970 to 2007, and our findings provide insight into the impact of manufacturing on the international competitiveness of European firms and industries. From the estimated magnitude of the relevant coefficients, we conclude that in the long run, a change in labor and capital compensation is not fully passed on to manufacturing growth, while an increase in the market power of the manufacturing sector will negatively affect its competitiveness.  相似文献   
85.
The remarks that follow are made with regard to the behavior of leaders whose self-image is threatened by a variety of conditions comprising the world problematique. Of all those conditions, surely those associated with violence and warfare are the most threatening. I would speculate, therefore, that what I've written here is especially pertinent for deliberations on how to encourage peace and disarmament.While these remarks are focused on the behavior of leaders—especially those in government—they can hold, too, for those in the public who identify with those leaders…itself another psychodynamic process. Of course, the public's contexts differ so the degree of threat and response will differ, too. This is a matter for further attention.Moreover, self-images are usually rich in content and while some aspects are threatened, others may not be or, indeed, may be attracted by new rational ideas. The resultant struggle within the psyche complicates the overt expression of these unconscious conflicts.But these dynamics mirror those comprising the problematique, especially its expression around issues of war and peace. Therefore, psychodynamic matters deserve as much attention and utilization as we now give to conventional, indeed, often ritual means, masquerading as rationality, for dealing with violence and armaments.  相似文献   
86.
In 1977 the Foreign Corrupt Practices Act (FCPA) was enacted to penalize US firms and their employees for paying bribes to foreign government officials. If bribe payments influence the awarding of contracts and the FCPA regulation differentially affects US exporters compared to foreign competitors, then US exporters' bribe-paying ability and market share would be expected to decline. This study provides empirical evidence that the FCPA had a negative effect on US exports to non-Latin American countries but not to bribery prone ones in Latin America.  相似文献   
87.
Abstract . Henry George's influence was greater in the United Kingdom than in the United States. The 80s and 90s there were particularly favorable for the reception of his revolutionary ideas. Though, thanks to such thinkers as Alfred Russell Wallace and James and John Stuart Mill, a land reform movement already existed, its sudden rise to national significance was due to George. George's writing and speaking skills and his dedication moved many serious citizens into the political Left and heavily influenced men and women who became leaders of British non-Marxian socialism, at the formation and consolidation of their movement. While George's followers broke with both the Wallace and socialist movements, George's rhetorical talents awakened the broad circles of thinking people to a consciousness of the full range of the social question.  相似文献   
88.
89.
90.
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