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   2139篇
  免费   95篇
  国内免费   14篇
财政金融   784篇
工业经济   56篇
计划管理   278篇
经济学   370篇
综合类   157篇
运输经济   44篇
旅游经济   13篇
贸易经济   241篇
农业经济   114篇
经济概况   191篇
  2024年   8篇
  2023年   43篇
  2022年   44篇
  2021年   56篇
  2020年   110篇
  2019年   100篇
  2018年   75篇
  2017年   74篇
  2016年   76篇
  2015年   76篇
  2014年   150篇
  2013年   206篇
  2012年   138篇
  2011年   180篇
  2010年   112篇
  2009年   91篇
  2008年   129篇
  2007年   99篇
  2006年   105篇
  2005年   92篇
  2004年   50篇
  2003年   46篇
  2002年   41篇
  2001年   30篇
  2000年   27篇
  1999年   19篇
  1998年   25篇
  1997年   17篇
  1996年   11篇
  1995年   6篇
  1994年   4篇
  1993年   4篇
  1992年   2篇
  1991年   1篇
  1989年   1篇
排序方式: 共有2248条查询结果,搜索用时 15 毫秒
171.
In the case of emission of non-uniformly dispersed pollutants such as SO2 the negative effects depend on the location of the sources. A unit increase at one source must be compensated by either a larger or smaller reduction at another source to keep the negative effects at the same level. Emission trading between countries is possible under the Second Sulphur Protocol. Exchange rate trading and third party problems are studied within a simultaneous model facilitating impositions of various environmental constraints. Simulations based on the negotiated emission quotas are offered. Results indicate potential cost savings of 19%.  相似文献   
172.
Technical traders base their analysis on the premise that the patterns in market prices are assumed to recur in the future, and thus, these patterns can be used for predictive purposes. This paper uses the daily Dow Jones Industrial Average Index from 1897 to 1988 to examine the linear and nonlinear predictability of stock market returns with simple technical trading rules. The nonlinear specification of returns are modelled by single layer feedforward networks. The results indicate strong evidence of nonlinear predictability in the stock market returns by using the past buy and sell signals of the moving average rules.  相似文献   
173.
This study is an empirical test of the Easley, O'Hara, and Srinivas (1998) multimarket sequential trade model of stock and option markets. We employ two approaches to determine the information content of signed stock and option trades executed around quarterly earnings announcements. The first approach expands the vector autoregression (VAR) technique of Hasbrouck (1991a) to include signed option trade volumes and inter‐trade durations. Estimates from the VAR models provide insight into whether both equity and option trades are viewed as informative by the equity specialist. The second approach focuses on the information content of the earnings releases to determine whether signed equity and option trades executed prior to the announcements are informed. Results indicate that although informed traders prefer to transact in both markets around earnings announcements, option market transactions contain no incremental information.  相似文献   
174.
“交易外部性”:外部性的重新理解及系统整合   总被引:1,自引:0,他引:1  
基于对外部性和交易本质的理解,当前生产外部性和消费外部性两分的观点有失偏颇。研究提出"交易外部性"概念,即产权交易过程中,交易一方或交易以外的行为主体的权利(束)或权利部分职能被交易另一方强制利用而未被定价或实现对等补偿的现象。据此,按照发生领域和作用主体的不同,外部性可以划分为生产外部性、消费外部性和交易外部性三类,其中,交易外部性进一步包含一类交易外部性、二类交易外部性和三类交易外部性。此处的"二类交易外部性"与史普博的"内部性"具有相同的本质内涵,即"内部性"实质是"交易外部性"范畴下的一个子分类。  相似文献   
175.
我国自20世纪90年代开始引进排污权交易制度以来,已经经过了20年的时间,目前还处在试点中,距系统化、规范化的排污权交易市场的建立还有很大差距。文章指出,加快我国排污权交易市场的建设步伐,必须从分析构建排污权交易市场的关键要件出发,逐个突破。文章分析了影响我国排污权交易市场建立的几个关键的技术要件,并就目前应如何去突破提出了自己的看法和建议,以期为推动我国系统化、规范化公平有效的排污权交易市场的建立提供理论和技术支持。  相似文献   
176.
More and more investors apply socially responsible screens when building their stock portfolios. This raises the question whether these investors can increase their performance by incorporating such screens into their investment process. To answer this question we implement a simple trading strategy based on socially responsible ratings from the KLD Research & Analytics: Buy stocks with high socially responsible ratings and sell stocks with low socially responsible ratings. We find that this strategy leads to high abnormal returns of up to 8.7% per year. The maximum abnormal returns are reached when investors employ the best‐in‐class screening approach, use a combination of several socially responsible screens at the same time, and restrict themselves to stocks with extreme socially responsible ratings. The abnormal returns remain significant even after taking into account reasonable transaction costs.  相似文献   
177.
Abstract:  This study investigates how limit orders affect liquidity in a purely order-driven futures market. Additionally, the possible asymmetric relationship between market depth and transitory volatility in bull and bear markets and the effect of institutional trading on liquidity provision behavior are examined as well. The empirical results demonstrate that subsequent market depth increases as transient volatility increases in bull markets. Market depth exhibits significantly positive relationship to subsequent transient volatility in bull markets. Additionally, although trading volume positively influences transient volatility in bull markets, no such relationship exists in bear markets. Liquidity provision decreases when institutional trading activity intensifies during bear markets. Thus, liquidity provision for limit orders differs between bull and bear markets.  相似文献   
178.
Investors can exploit the correlations between international stock markets by trading no-load, open-end, international mutual funds. These investors in effect cheat passive investors because they buy the mutual funds at their net asset values, which do not reflect information released during the US trading day. The strategy we examine yields an annual rate of return 800 basis points above the S&P500, over a period of almost eight years.  相似文献   
179.
This paper proposes and investigates an explanation for a positive association between the signed value of common share returns and trading activity. The mixture of distributions model for stock returns and trading is applied with the added assumption that product sales for a firm is the directing process which generates the flow of information to equity markets. Because trading depends upon information arrival, sales and trading are positively related. Also, because contribution margin is positive, cash flows increase with sales. Dependence of both cash flows and trading on sales implies that returns and trading are also positively related. This explanation is tested in this paper.  相似文献   
180.
The New Zealand Stock Exchange (NZSE) switched from open outcry trading to an electronic screen trading system on June 24, 1991. The change was made by the members of the exchange to improve the trading system and to reduce costs. This paper investigates empirically whether improvement was achieved through a reduction in transaction costs. The tests and results focus on order-flow migration to the exchange from alternative execution locations and changes in bid-ask spreads. On balance, we conclude that transaction costs have declined.  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