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   5002篇
  免费   153篇
财政金融   922篇
工业经济   421篇
计划管理   936篇
经济学   1085篇
综合类   47篇
运输经济   44篇
旅游经济   100篇
贸易经济   874篇
农业经济   204篇
经济概况   517篇
信息产业经济   1篇
邮电经济   4篇
  2023年   26篇
  2021年   41篇
  2020年   80篇
  2019年   100篇
  2018年   124篇
  2017年   144篇
  2016年   116篇
  2015年   87篇
  2014年   130篇
  2013年   624篇
  2012年   148篇
  2011年   194篇
  2010年   178篇
  2009年   214篇
  2008年   183篇
  2007年   169篇
  2006年   162篇
  2005年   148篇
  2004年   143篇
  2003年   155篇
  2002年   134篇
  2001年   113篇
  2000年   118篇
  1999年   122篇
  1998年   106篇
  1997年   82篇
  1996年   94篇
  1995年   73篇
  1994年   77篇
  1993年   72篇
  1992年   75篇
  1991年   82篇
  1990年   54篇
  1989年   37篇
  1988年   39篇
  1987年   45篇
  1986年   47篇
  1985年   67篇
  1984年   54篇
  1983年   49篇
  1982年   50篇
  1981年   51篇
  1980年   43篇
  1979年   41篇
  1978年   28篇
  1977年   25篇
  1976年   24篇
  1975年   19篇
  1974年   26篇
  1973年   18篇
排序方式: 共有5155条查询结果,搜索用时 15 毫秒
31.
32.
A Consumer-Based Approach to Designing Product Line Extensions   总被引:1,自引:0,他引:1  
A high proportion of new product introductions entail line extensions (e.g., new flavors, sizes, convenience packs, features) rather than totally new products. An attendant problem with line extending involves the possibility of cannibalization of the firm's current products. Paul Green and Abba Krieger describe an approach for designing line extensions that employs consumer tradeoff data and a variety of search heuristics to find "optimal" extensions that explicitly consider the cannibalization of current offerings. The methodology is applied to a case in which an agricultural chemicals firm is introducing a new soybean herbicide.  相似文献   
33.
There is a growing literature on the importance of being first, which suggests that where there is uncertainty about the product quality of late entrants' brands the pioneering brand will retain a competitive advantage. This is consistent with studies of the U.S. drug industry. Using Canadian data for the drug industry it is shown that eliminating quality differences is a necessary but not sufficient condition for late entrants to gain market share. In addition, price competition has to be stimulated. Under these conditions the late entrants have taken up to 100 percent of the pioneering brands market.  相似文献   
34.
故事发生在积雪覆顶的雪山上,一个迷路的旅行者在寒冷的暴风雪中苦苦寻找一个落脚点,沿途一直有野狼紧随其后、伺机而动。饥寒交迫中,他终于忍不住而晕倒在地。狼群奔向晕倒的旅行者,静静地依偎在他身上、为他取暖。“不是非要相识,才能相拥入怀。”  相似文献   
35.
There is increasing scientific evidence that natural systems are now at a level of stress globally that could have profound negative effects on human societies worldwide. In order to avoid these effects, one, or a number of technological transitions will need to take place through transforming processes of eco-innovation, which have complex political, institutional and cultural, in addition to technological and economic, dimensions. Measurement systems need to be devised that can assess to what extent eco-innovation is taking place. Environmental and eco-innovation have already led in a number of European countries to the establishment of substantial eco-industries, but, because of the general absence of environmental considerations in markets, these industries are very largely the result of environmental public policies, the nature and effectiveness of which have now been assessed through a number of reviews and case studies. The paper concludes that such policies will need to become much more stringent if eco-innovation is to drive an adequately far-reaching technological transition to resolve pressing environmental challenges. Crucial in the political economy of this change will be that eco-industries, supported by public opinion, are able to counter the resistance of established industries which will lose out from the transition, in a reformed global context where international treaties and co-operation prevent the relocation of environmentally destructive industries and encourage their transformation.  相似文献   
36.
This article presents analyses of the National Assessment Program – Literacy and Numeracy (NAPLAN) data and data on other indicators that are made available through the My School website. There are large differences across states and types of schools (independent, Catholic and government) in the Year 3 NAPLAN outcomes, though the differences across states tend to diminish as outcomes for later years of study are examined. Some schools are shown to consistently have academic outcomes better than their characteristics would otherwise indicate; conversely, other schools are shown to consistently have academic outcomes below the levels their characteristics would otherwise indicate. Few of these differences are statistically significant.  相似文献   
37.
38.
While the Chandlerian firm has come to dominate large sectors of advanced economies, recent studies have shown that the properties of knowledge used by firms, the dynamic nature of transaction costs, and the impact of information and communication technologies on organisations might reduce firm scale and scope. We present a contingent model of firm boundaries that explains why, as a result of technological change, firms might simultaneously outsource some activities that they had formerly preferred to produce in-house while increasing their vertical integration in other areas. We support our conclusions with evidence from different industries.  相似文献   
39.
For the ten crop seasons 1979-80 to 1988-89, returns to producers in the Australian wheat industry were underwritten by a government-guaranteed price floor. Similar schemes operate in other rural industries (dairy, apples and pears, dried fruits). Although the underwriting provisions have only been triggered once (in the 1986-87 season), the provision of this scheme has acted to reduce the risk normally associated with returns to producers of wheat in all years of its operation. This reduction in risk has been granted free-of-charge by the Commonwealth Government. The guaranteed price can be viewed as a put option taken out by the Government on behalf of growers — it gives growers the option to sell to the Australian Wheat Board at this floor price. The aim of this paper is to apply to this underwriting arrangement the Black-Scholes formula for valuing options, in order to estimate the cost that growers would otherwise have had to pay to obtain cover (through put options) equivalent to the guaranteed price. We also estimate the magnitude of this form of assistance to the industry, which (until now) has not been taken into account unless the returns to growers fell below the guaranteed price.  相似文献   
40.
The creation of the Asian Infrastructure Investment Bank (AIIB)was welcomed by the World Bank but opposed by the Obamaadministration. The paper explains China’s positive relationshipwith the Bank and the Organization for Economic Cooperation andDevelopment (OECD) in terms of the mission of the Bank, sharedby the OECD, to develop and deepen the global economy. The AIIBand the related Belt and Road initiative promise to do this throughinvestment in infrastructure and connectivity in and around thepoorly integrated Eurasian landmass. But while the current Chineseleadership has supported an inclusive global economy based uponfree trade and supported by multilateral institutions, China’s controlof resources outside the multilateral framework and adherence topractices that challenge liberal principles prompt suspicions thatthese commitments are either disingenuous or anyway subjectto reversal. In itself, therefore, the AIIB provides no conclusiveevidence either way on China’s future course.  相似文献   
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