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   12250篇
  免费   362篇
财政金融   2324篇
工业经济   978篇
计划管理   2138篇
经济学   2688篇
综合类   161篇
运输经济   84篇
旅游经济   180篇
贸易经济   1895篇
农业经济   618篇
经济概况   1523篇
信息产业经济   2篇
邮电经济   21篇
  2021年   93篇
  2020年   151篇
  2019年   232篇
  2018年   252篇
  2017年   292篇
  2016年   304篇
  2015年   167篇
  2014年   288篇
  2013年   1278篇
  2012年   390篇
  2011年   437篇
  2010年   369篇
  2009年   399篇
  2008年   372篇
  2007年   343篇
  2006年   300篇
  2005年   246篇
  2004年   232篇
  2003年   237篇
  2002年   264篇
  2001年   242篇
  2000年   259篇
  1999年   236篇
  1998年   232篇
  1997年   236篇
  1996年   240篇
  1995年   190篇
  1994年   196篇
  1993年   202篇
  1992年   207篇
  1991年   202篇
  1990年   203篇
  1989年   155篇
  1988年   149篇
  1987年   146篇
  1986年   150篇
  1985年   234篇
  1984年   185篇
  1983年   165篇
  1982年   158篇
  1981年   165篇
  1980年   154篇
  1979年   154篇
  1978年   164篇
  1977年   98篇
  1976年   112篇
  1975年   101篇
  1974年   80篇
  1973年   95篇
  1972年   74篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
A model to simulate the costs and returns of an individual dairy cow over 14 years under various assumptions of genetic potential, health status and management was developed especially to evaluate the effects of diseases that reduce production and reproduction efficiency and to evaluate alternative management interventions. Data were collected from the Food Animal Health Resource Management System (FAHRMX), Today's Electronic Planning (TELPLAN), Today's Electric Farm Accounting (TELFARM) databases and secondary sources at Michigan State University. A case study of cystic ovaries was analysed using the model. The results showed that it is more economical to treat cystic ovaries than not to treat, and treatment with Gonadotropin Releasing Hormone (GNRH) was superior to Human Chrionic Gonadotropin (HCG). Four to five lactations were the optimum for keeping a dairy cow to replacement and it was estimated that there is a loss of US$0.45 per day of extended calving interval (days open beyond the optimal 70 days).  相似文献   
112.
The economic impact of adopting herd health programs for mastitis and reproduction by small-scale dairy producers of Central Thailand was assessed using a policy analysis matrix (PAM). Following a reduction in the incidence of bovine disease on adopter farms, an increase in private net profits is observed. More importantly the social costs of supporting dairy farmers is reduced; the PAM effective protection coefficient was reduced by 35% for mastitis program adopters and by 44% for reproductive program adopters, indicating improved social efficiency of dairy policy. Other indicators of efficiency and policy implications are discussed.  相似文献   
113.
This study examines how factor point systems have treated state government jobs, which are held disproportionately by women, minorities, and union members. The findings indicate that female jobs may gain from comparable worth pay proposals, but the gains are dissipated in actual pay; unionized and minority workers tend to lose both proposed and actual pay; and the dispersion of points and pay is narrowed for jobs covered by collective bargaining agreements  相似文献   
114.
In this paper we re-examine the effect of 12b–1 payments on mutual fund expense ratios by analyzing data from 1988 through 1991. The findings are consistent with previous studies that find charges are a dead-weight cost borne by shareholders. However, we show that this cost increases over time.  相似文献   
115.
116.
117.
Abstract: The dwindling nature of overseas development assistance in the early part of the 1990s called for the establishment of capital markets in some African countries, including Ghana, with the view to increasing foreign direct investments and achieving sustainable inflows, growth and development. One important factor which affects the determination of prices and the growth of capital markets is macroeconomic risk which is quite high in developing countries. Following works done on advanced stock markets, this study seeks to investigate the impact of six macroeconomic risk factors on asset pricing in the various industrial classification — financial, manufacturing, food and beverages, distribution and mining under the Ghana Stock Exchange (GSE) for the period January 1997 to December 2002. Using the arbitrage pricing methodology developed by Ross (1976) and Chen et al. (1986) , the study revealed that investors in Ghana considered three main macroeconomic risk factors — short‐term interest rate risk, inflation risk and the term structure of the country's interest rate in the determination of the various industrial asset prices during the period under consideration. Analysis of the risks and returns profile of the industries also shows that financial assets made the best gains on the market. Both general and specific policy recommendations aimed at improving the performance of the GSE are explored.  相似文献   
118.
The objective of this paper is to examine the effects of marking‐to‐market of futures contracts on the price differential between futures and forward contracts based on the predictions of the Cox, Ingersoll and Ross (1981) (CIR) model. Cox et al ., (1981) derive a series of propositions with respect to the relationship between futures and forward prices and a set of testable implications. These are tested empirically in this paper using Australian data from November 1991 to June 1997. The results provide evidence of the presence of significant futures and forward price differences, where the futures price is consistently below the forward price. Only partial support is found for the Cox et al ., (1981) propositions, implying that the effect of marking‐to‐market is not able to fully account for the price differential. Therefore, it is not possible to rule out the influence of other institutional factors on the futures‐forward price difference.  相似文献   
119.
120.
Sound financial planning and financial advice is necessary to achieve retirement income adequacy. The shift from defined benefit to defined contribution pension plans and the recent bankruptcy of Enron Corporation underscore the importance of managing retirement accumulation and liquidation risks. This study analyzes the effectiveness and adequacy of institutional-provided information and advice on employees' retirement planning decisions and their satisfaction with financial resources during retirement. Results suggest that retirement planning should begin earlier in an employee's career and that employer-provided retirement information and advice is a highly valued service. Gender, planning practices, job classification, and age are all significant predictors of satisfaction with financial resources during retirement. Targeting women and union employees with retirement information and advice that focuses on allocating contributions using a balanced portfolio approach should result in significant increases in satisfaction with financial resources during retirement. Regulatory objectives should focus on reducing retirement accumulation and liquidation risks, improving the delivery of professional financial advice to plan participants, and expanding qualified retirement plan choice for all labor force participants. To encourage employer participation in employee retirement planning, employers acting in "good faith" should be federally protected from liability for providing retirement planning information and advice to employees.  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