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   33170篇
  免费   4619篇
  国内免费   1篇
财政金融   5137篇
工业经济   3304篇
计划管理   4604篇
经济学   8322篇
综合类   524篇
运输经济   204篇
旅游经济   451篇
贸易经济   6770篇
农业经济   3806篇
经济概况   4599篇
信息产业经济   1篇
邮电经济   68篇
  2023年   519篇
  2022年   305篇
  2021年   316篇
  2020年   744篇
  2019年   1391篇
  2018年   1268篇
  2017年   1325篇
  2016年   1230篇
  2015年   934篇
  2014年   1252篇
  2013年   3373篇
  2012年   1670篇
  2011年   1457篇
  2010年   1335篇
  2009年   1348篇
  2008年   1099篇
  2007年   1095篇
  2006年   951篇
  2005年   854篇
  2004年   859篇
  2003年   680篇
  2002年   660篇
  2001年   541篇
  2000年   530篇
  1999年   495篇
  1998年   479篇
  1997年   481篇
  1996年   455篇
  1995年   395篇
  1994年   409篇
  1993年   442篇
  1992年   475篇
  1991年   488篇
  1990年   357篇
  1989年   333篇
  1988年   304篇
  1987年   312篇
  1986年   315篇
  1985年   481篇
  1984年   442篇
  1983年   412篇
  1982年   395篇
  1981年   349篇
  1980年   394篇
  1979年   325篇
  1978年   278篇
  1977年   261篇
  1976年   204篇
  1975年   244篇
  1974年   195篇
排序方式: 共有10000条查询结果,搜索用时 160 毫秒
111.
This study investigates the relative roles of bond ratings and financial information in the setting of bond yields. Structural equation modeling techniques are used to learn whether ratings determine yields or whether both ratings and yields are determined by a concurrent set of economic and financial factors. Tests of alternative structural model configurations provide evidence regarding the associations between bond ratings, financial information, and bond yields. Both ratings and financial information are found to play an important role in determining bond yields. In addition, yields are consistent with the higher rating in cases of split ratings.  相似文献   
112.
This article presents the results of a questionnaire survey sent to a sample of automobile manufacturers in the United States and Japan (including Japanese-managed plants in the United States) during the spring of 1990. The data support observations that Japanese and U.S. practices tend to differ in key areas and Japanese suppliers perform better in dimensions such as quality (defects) and prices (meeting targets, reducing prices over time); and that Japanese-managed auto plants established in the United States have, in general, adopted Japanese practices and receive extremely high levels of quality from Japanese as well as U.S. suppliers. These findings provide evidence that Japanese practices and performance levels are transferable outside Japan and suggest that considerable improvements are possible for U.S. suppliers supplying U.S. auto plants. In addition, the survey indicates that U.S. firms have adopted at least some practices traditionally associated with Japanese firms, apparently reflecting some convergence toward Japanese practices and higher performance levels in supplier management.  相似文献   
113.
114.
115.
This paper investigates interactions between exporting and productivity at the firm level, using a panel of firms in the UK chemical industry. This is both highly technology intensive and the UK’s largest exporting sector. We find exporters are more productive than non-exporters, but are also on average smaller. This superior productivity performance among exporters appears to be caused by both self-selection and learning-by-exporting effects. In contrast to other studies, we find learning effects are significantly positive among new entrants, weaker for more experienced exporters and negative for established exporters. JEL no. F14, D21, L65  相似文献   
116.
Optimal investment rules are developed for a producer agency investing in domestic-market generic advertising, export market promotion, and cost-of-production-reducing research. These rules are derived assuming either maximization of producers' surplus or social surplus. The form of the optimality rules differs according to which objective is pursued. Fixed producer agency budgets are also allowed by incorporating a constraint limiting total expenditure on the three activities. Addition of such a constraint substantially alters the structure of the optimal investment rules. Differences in these rules highlight the importance of accounting for the financing mechanism when modeling optimal checkoff fund investment decisions. Optimality rules are simulated using data for the Canadian beef sector. Results suggest historic underinvestment in domestic-market generic advertising but overinvestment in export market promotion. Sensitivity of simulation results underscores the difficulty in assessing optimality of historic producer investment in cost-of-production-reducing research.  相似文献   
117.
This paper analyzes the dynamic relationship between primary and secondary mortgage markets and the short-term and long-term market interest rates. Using a series of monthly data on fixed rate mortgage rates and GNMA rates, we explore the dependence and speed of adjustment in these primary and secondary mortgage rates to each other as well as to the long and short-term government rates. The results indicate that residential mortgage rates in general, appear to follow the long-term rate and are not very sensitive to movements in the short-term interest rate.  相似文献   
118.
119.
120.
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