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   8793篇
  免费   334篇
财政金融   1866篇
工业经济   769篇
计划管理   1441篇
经济学   1833篇
综合类   115篇
运输经济   100篇
旅游经济   167篇
贸易经济   1866篇
农业经济   264篇
经济概况   634篇
信息产业经济   4篇
邮电经济   68篇
  2023年   59篇
  2022年   49篇
  2021年   82篇
  2020年   134篇
  2019年   210篇
  2018年   234篇
  2017年   257篇
  2016年   221篇
  2015年   184篇
  2014年   294篇
  2013年   1052篇
  2012年   329篇
  2011年   371篇
  2010年   345篇
  2009年   388篇
  2008年   343篇
  2007年   297篇
  2006年   274篇
  2005年   299篇
  2004年   250篇
  2003年   260篇
  2002年   255篇
  2001年   206篇
  2000年   189篇
  1999年   190篇
  1998年   158篇
  1997年   162篇
  1996年   132篇
  1995年   124篇
  1994年   133篇
  1993年   126篇
  1992年   114篇
  1991年   105篇
  1990年   69篇
  1989年   79篇
  1988年   73篇
  1987年   69篇
  1986年   69篇
  1985年   115篇
  1984年   99篇
  1983年   89篇
  1982年   93篇
  1981年   66篇
  1980年   74篇
  1979年   68篇
  1978年   60篇
  1977年   63篇
  1976年   58篇
  1974年   32篇
  1973年   22篇
排序方式: 共有9127条查询结果,搜索用时 14 毫秒
101.
What are the behavioral origins of pioneer brand advantage? This article provides an integrative conceptual framework and propositional inventory to help more fully understand this multifaceted phenomenon. It is proposed that there are three sources of entry-order information that work through various psychological processes and affect multiple decision process variables. The conceptual framework translates into eight testable propositions. New exploratory evidence is presented. Managerial implications are discussed.  相似文献   
102.
Management Review Quarterly - Additive manufacturing (AM) is regarded as a technology that has transformative and disruptive potential in nearly all industries. However, AM is not only about new...  相似文献   
103.
Conservation is a crisis discipline requiring rapid action with limited funds. This study examines the potential of socioeconomic variables to predict forest use values. If natural resource use can be predicted from socioeconomic data, conservation planners could rapidly identify and focus conservation programs on the sectors of local populations that most intensively utilize local flora and fauna. Families in three communities in the northern Peruvian Amazon were surveyed over a 6-month period. Data were collected on use of flora and fauna from six locally determined use categories (food, medicine and poisons, wood, weavings, adornments, and “other”) in forest types of three age classes (fallow fields—very young forests, young secondary forests, and old secondary forests). Forest use values were the dependant variables calculated in $/ha/year. Socioeconomic variables included: age, education, family size, residence time, land worked, land owned, number of fishing nets, chickens, pigs, cows, and/or mules owned (all proxies for productive assets), and level of ecological knowledge (ability of informants to correctly identify forest species and answer basic questions about their biology). Ordinary least square multiple regressions were run independently for each forest type. Regressions were also run separately for the two most valuable use categories, food and wood. Low R2 adjusted values (all < 0.3) reflect the difficulty in predicting human behavior due to confounding variables and complex interactions. Residence time and a household's community of residence were the most significant predictors of forest use values. Households in Vista Alegre, the community with the highest density of people and smallest landholdings per household, extracted the highest value of forest products per hectare. The longer a family stayed in any community the higher the value of forest goods they extracted. If families that lived in an area longest are the most intensive extractors of forest products, they should be a major focus for conservation programming. In addition, the higher value of products extracted from forests by some families may make them more open to strategies seeking to protect long-term viability of the resources they utilize. The importance of residence time also indicates that planners need to account for changes in the resource use patterns of stakeholders over time.  相似文献   
104.
105.
Summary. Simple search models have equilibria where some agents accept money and others do not. We argue such equilibria should not be taken seriously. This is unfortunate if one wants a model with partial acceptability. We introduce heterogeneous agents and show partial acceptability arises naturally and robustly. There can be multiple equilibria with different degrees of acceptability. Given the type of heterogeneity we allow, the model is simple: equilibria reduce to fixed points in [0,1]. We show that with other forms of heterogeneity equilibria are fixed points in set space, and there is no method to reduce this to a problem in R1.Received: 4 September 2002, Revised: 23 September 2002JEL Classification Numbers: C78, E40.A. Shevchenko, R. Wright: We thank seminar participants at the Federal Reserve Bank of Cleveland, Indiana University, Purdue University, University of Toronto, the 2002 Midwest Macroeconomics Conference at Vanderbilt University, and the 2001 Conference on Economic Dynamics at the University of Essex. The National Science Foundation and the Federal Reserve Bank of Cleveland provided financial support. Braz Ministerio de Camargo and Gabriel Camera provided some helpful suggestions. Correspondence to: R. Wright  相似文献   
106.
107.
The Kyoto Protocol foresees emission trading but does not yet specify verification of (uncertain) emissions. This paper analyses a setting in which parties can meet their emission targets by reducing emissions, by investing in monitoring (reducing uncertainty of emissions) or by (bilaterally) trading permits. We derive the optimality conditions and carry out various numerical simulations. Our applications suggest that including uncertainty could increase compliance costs for the USA, Japan and the European Union. Central Europe and the Former Soviet Union might be able to gain from trading due to higher permit prices. Emissions trading could also lower aggregate uncertainty on emissions.  相似文献   
108.
We argue that the proper specification of a panel gravity model should include main (exporter, importer, and time) as well as time invariant exporter-by-importer (bilateral) interaction effects. In a panel of 11 APEC countries, the latter are highly significant and account for the largest part of variation. First version received: February 2001/Final version received: June 2002 RID="*" ID="*"  We are grateful to two anonymous referees and Robert Kunst for their helpful comments.  相似文献   
109.
110.
Summary. We analyze an oligopoly model of homogeneous product price competition that allows for discontinuities in demand and/or costs. Conditions under which only zero profit equilibrium outcomes obtain in such settings are provided. We then illustrate through a series of examples that the conditions provided are “tight” in the sense that their relaxation leads to positive profit outcomes. Received: April 7, 2000; revised version: September 14, 2000  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