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   139407篇
  免费   3244篇
  国内免费   1篇
财政金融   26137篇
工业经济   11658篇
计划管理   22277篇
经济学   30114篇
综合类   1493篇
运输经济   973篇
旅游经济   2512篇
贸易经济   23882篇
农业经济   6170篇
经济概况   17141篇
信息产业经济   7篇
邮电经济   288篇
  2021年   843篇
  2020年   1640篇
  2019年   2399篇
  2018年   2413篇
  2017年   2559篇
  2016年   2727篇
  2015年   2108篇
  2014年   3421篇
  2013年   15393篇
  2012年   4252篇
  2011年   4262篇
  2010年   3775篇
  2009年   4385篇
  2008年   3998篇
  2007年   3356篇
  2006年   3640篇
  2005年   3634篇
  2004年   3219篇
  2003年   2979篇
  2002年   2932篇
  2001年   2726篇
  2000年   2644篇
  1999年   2504篇
  1998年   2392篇
  1997年   2388篇
  1996年   2272篇
  1995年   2070篇
  1994年   2098篇
  1993年   2073篇
  1992年   2113篇
  1991年   2024篇
  1990年   1891篇
  1989年   1718篇
  1988年   1654篇
  1987年   1659篇
  1986年   1745篇
  1985年   2510篇
  1984年   2400篇
  1983年   2204篇
  1982年   2063篇
  1981年   1978篇
  1980年   1949篇
  1979年   1879篇
  1978年   1679篇
  1977年   1639篇
  1976年   1394篇
  1975年   1297篇
  1974年   1192篇
  1973年   1191篇
  1972年   903篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
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   
122.
The 1992 Horizontal Merger Guidelines of the Department of Justice and the Federal Trade Commission outline an enforcement policy which makes a long overdue break with its predecessors in awarding no decisive or predominant role to market concentration as a criterion of anticompetitive effect. However, the new policy does not provide an adequate substitute criterion: the tests that it prescribes for screening merger proposals are so specified that a potentially large proportion of anticompetitive mergers can escape challenge without showing any promise of improving efficiency. The time is ripe for a comprehensive inquiry aimed at formulating a more satisfactory policy.  相似文献   
123.
124.
125.
We examine the role of index futures trading in spot market volatility. We use the exponential generalized autoregressive conditional heteroskedasticity (EGARCH) approach to measure volatility, analyze causality and feedback relations between volatilities in the spot and futures markets, and test various hypotheses in the context of a multivariate model that incorporates other macrostate variables. Our empirical results suggest index futures trading may not be blamed for the observed volatility in the spot market. Rather, we find stronger and more consistent support for the alternative posture that volatility in the futures market is an outgrowth of a turbulent cash market. We use the regret (cognitive dissonance) theory to explain our results.  相似文献   
126.
127.
A model that addresses the similarities and differences in conceptual antecedents of attitudes toward private label grocery products and national brand promotions is proposed and tested. The proposed model is tested using a sample of 300 consumers who were recruited from grocery stores, provided behavioral data from sales receipts of their shopping trip, and responded to a survey that contained multi-item construct measures. We predict and find in the study that both price and nonprice related constructs impact both private label attitude and national brand promotion attitude, but the directionality and strength of several of these relationships differ. Implications of these findings for retailers and national manufacturers are discussed.  相似文献   
128.
This research extends the literature on nonfinancial performance measures (NFPMs) by assessing (1) the information content of a broader set of NFPMs and (2) whether NFPMs provide information not provided by financial performance measures (FPMs) from all previously identified FPM categories, rather than just earnings and book value. Specifically, exploratory and confirmatory factor analysis results presented in this paper demonstrate that nineteen NFPMs of major airlines capture seven underlying constructs not captured by eighteen common FPMs. Additionally, this research develops reliable composite measures of the identified performance measure constructs, which prior research argues are superior to individual performance measures.  相似文献   
129.
130.
Regime Shifts in Asian Equity and Real Estate Markets   总被引:4,自引:0,他引:4  
This paper applies a new statistical technology for identifying regime shifts to analyze recent data on real estate and equity markets in eight developing Far Eastern countries in the 1992–1998 time period. We find that regime shifts in volatility occur in the summer of 1997; however, most of the regime shifts in returns occur in the spring of 1998. While the clustering of regime breaks does not seem to follow any obvious pattern, the country's exposure to trade and firm leverage are important. An analysis of Granger causality suggests that, in most cases, equity returns cause real estate returns but the converse is not true. We also find two-way causality in volatility, suggesting that a common factor drives volatility in these markets. Finally, we provide evidence that the regime shifts generally imply higher relative risk for real estate securities after the estimated breaks.  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