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   35813篇
  免费   833篇
财政金融   6784篇
工业经济   2667篇
计划管理   5939篇
经济学   8119篇
综合类   416篇
运输经济   220篇
旅游经济   581篇
贸易经济   5835篇
农业经济   1625篇
经济概况   4387篇
邮电经济   73篇
  2021年   216篇
  2020年   358篇
  2019年   498篇
  2018年   648篇
  2017年   634篇
  2016年   628篇
  2015年   481篇
  2014年   704篇
  2013年   3492篇
  2012年   988篇
  2011年   1081篇
  2010年   880篇
  2009年   1036篇
  2008年   1091篇
  2007年   995篇
  2006年   918篇
  2005年   880篇
  2004年   858篇
  2003年   847篇
  2002年   782篇
  2001年   746篇
  2000年   748篇
  1999年   645篇
  1998年   668篇
  1997年   622篇
  1996年   625篇
  1995年   564篇
  1994年   605篇
  1993年   604篇
  1992年   573篇
  1991年   587篇
  1990年   537篇
  1989年   447篇
  1988年   456篇
  1987年   465篇
  1986年   476篇
  1985年   700篇
  1984年   649篇
  1983年   658篇
  1982年   591篇
  1981年   531篇
  1980年   513篇
  1979年   526篇
  1978年   461篇
  1977年   443篇
  1976年   346篇
  1975年   330篇
  1974年   291篇
  1973年   287篇
  1972年   224篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
The economics of land transfer and title insurance   总被引:3,自引:0,他引:3  
In the presence of uncertainty over the title of land (due to fraud or error), a legal system can protect either the current (innocent) owner, or a previous owner who claims title. The predominant system in the United States generally awards title to the latter in the event of legitimate claim. Thus, current owners frequently purchase title insurance to provide indemnification in the event of a loss. In contrast, the Torrens system awards title to the current owner, but provides for indemnification of any legitimate claimants. We evaluate these two systems and argue that if transaction costs are low, both promote efficient assignment of title (according to the Coase Theorem), but if transaction costs are high, the Torrens system is more likely to award title to the party that values it the most (namely, the current possessor).  相似文献   
82.
83.
Medic (Medicago spp.) pastures are widely grown in rotation with dryland cereal crops in Mediterranean climate zones of Australia. Attempts since the 1960's to introduce this system to Mediterranean west Asia and north Africa (the native region of medic) have not lead to significant adoption; farmers in the region recognize medic, but as a weed and natural pasture plant. This first detailed economic evaluation of the rotational medic system was conducted using a whole-farm linear programming model based on the agricultural system of north-west Syria. The model represents in detail impacts of rotation on yields, labor requirements of alternative farm activities, availability of family and hired labor, subsistence income requirements, livestock feed sources and uses at different times and a choice of sheep stocking rates. Biological data for the analysis are based on a large six-year cropping and grazing experiment near Aleppo on terra-rossa soil with rainfall mainly in winter and averaging about 330 mm annually. The trial compared a dryland medic-wheat system and traditional two-year rotations of wheat with: fallow, watermelon, lentil and vetch. Results indicate that, given current prices and yields from the trial, medic is less profitable than traditional rotations. The model was used to investigate situations in which medic would be economically preferred. Selection of a medic rotation by the model was found to be particularly sensitive to the area of the farm and the price of labor. On small farms, labor availability per hectare is high, favouring the production of labor intensive crops such as lentil and watermelon. On larger farms, labor costs of these enterprises are substantial, increasing the relative profitability of medic, especially if labor prices increase. Interestingly, the relative desirability of medic is more sensitive to its impact on subsequent wheat crops than to the level of pasture production. We also found that modest increases in the prices of sheep products (especially milk) have a major impact on the economic performance of medic. These insights will allow improved focusing and targeting of future research and extension activities.  相似文献   
84.
A conceptual framework of anonymity in Group Support Systems   总被引:2,自引:2,他引:0  
As the development and use of automated systems for collaborative work grows, the need for a better understanding of these systems becomes more important. Our focus is on one type of system, a Group Support System (GSS) and, in particular, on one important aspect of a GSS—anonymity. A conceptual framework for the study of anonymity in a GSS is presented, which describes the general classes of variables and their relationships. These variables include the factors that influence anonymity in a GSS, types of anonymity, and the effects of anonymity on a message sender, receiver, group process, and outcome. Each of these variables is discussed with working propositions presented for important group process and outcome measures. The objectives of this article are to highlight the importance and complexity of anonymity, to act as a guide for empirical investigations of anonymity, and to influence future GSS development and use.  相似文献   
85.
86.
J. J. Graafland 《De Economist》1992,140(4):501-514
Summary In most traditional macroeconomic models for The Netherlands the wage equation is specified by a Phillips curve, in which wage growth is negatively related to the unemployment rate. This paper shows, however, that wage formation can better be described by the so-called wage curve, in which the wage level, instead of wage growth, depends negatively on the unemployment rate.The author thanks S.K. Kuipers and D.A.G. Draper and other colleagues of the Central Planning Bureau for their useful comments.  相似文献   
87.
This study examines the effects of demographic characteristics on ethical perceptions. While earlier research has produced conflicting results regarding the predictive power of these variables, significant and definite insights were obtained with proper controls. The following predictors of ethical attitudes are examined: age, gender, marital status, education, dependent children status, region of the country and years in business, while controlling for job status. A nation-wide random sample of employees was used in obtaining a response rate of fifty-three percent (total n of 423). Indices of aspects of business ethical attitudes were constructed using factor analysis. Linear multiple regression analysis indicated the significant predictive variables. Age was found to be a most-significant predictor. Older workers had stricter interpretations of ethical standards. Gender and region predicted attitudes about job-discrimination practices only, with women and persons from the Midwest most strongly opposed to the practice. All the other variables proved to be unreliable ethics predictors.Paul Serwinek is a research affiliated with Wayne State University. He has done extensive research in business management and consulting work in the field of insurance agency employee job satisfaction.SPSS PC Plus Computer Program used.  相似文献   
88.
Business ethics has gained much attention over the past decade in both work and educational settings. This study used a version of Lysonski and Gaidis' (1991) ethical vignettes to examine by gender the ethical views of 165 Canadian undergraduate management students, to examine the psychometric properties and construct validity of the instrument, and to determine if the instrument is a useful tool for introducing undergraduates to the topic of ethics in management practice. Results showed that while the instrument is a useful teaching tool, it has psychometric and validity inadequacies that need to be corrected.Robert Loo is currently a Professor of Human Resource Management and Organizational Studies in the Faculty of Management at the University of Lethbridge, Canada. Over the past 20 years, he has published extensively in the management and psychology literature. Ethics is a key theme throughout every management course he teaches. Bob strives to make ethics a relevant and interesting issue for students by using a variety of learning techniques such as cases, videos, self-assessment tools, and research projects.  相似文献   
89.
90.
This article analyses the effects of action aimed at narrowing the gap between South Africa's ‘two agricultures’, specifically the effects of the Farmer Support Programme (FSP) on structural aspects of maize production under different marketing policies. This is done by assembling a sectoral linear programming model of the South African summer-rainfall grain-producing area. The emphasis is on the inclusion of supply, demand and production risk. Results show that the effects of a successful FSP on specific interest groups, e.g. consumers of a specific product, or producers in a specific region, depend on the marketing policy followed, as well as on the effectiveness of the FSP. The analysis accentuates the interrelationships in South African crop production and illustrates how past policies ignored regional comparative advantages, distorted regional development and affected social welfare.  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