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   7936篇
  免费   1329篇
  国内免费   25篇
财政金融   1237篇
工业经济   658篇
计划管理   1761篇
经济学   1690篇
综合类   383篇
运输经济   156篇
旅游经济   117篇
贸易经济   1749篇
农业经济   485篇
经济概况   1046篇
邮电经济   8篇
  2024年   6篇
  2023年   27篇
  2022年   71篇
  2021年   222篇
  2020年   284篇
  2019年   561篇
  2018年   312篇
  2017年   477篇
  2016年   447篇
  2015年   512篇
  2014年   575篇
  2013年   932篇
  2012年   699篇
  2011年   685篇
  2010年   618篇
  2009年   467篇
  2008年   459篇
  2007年   409篇
  2006年   372篇
  2005年   292篇
  2004年   165篇
  2003年   146篇
  2002年   162篇
  2001年   123篇
  2000年   77篇
  1999年   26篇
  1998年   28篇
  1997年   8篇
  1996年   20篇
  1995年   10篇
  1994年   10篇
  1993年   11篇
  1992年   5篇
  1991年   8篇
  1990年   7篇
  1989年   6篇
  1988年   8篇
  1987年   9篇
  1986年   6篇
  1985年   8篇
  1984年   6篇
  1983年   4篇
  1982年   1篇
  1980年   3篇
  1977年   3篇
  1973年   1篇
  1972年   1篇
  1969年   1篇
排序方式: 共有9290条查询结果,搜索用时 15 毫秒
941.
Stocks with large increases in call (put) implied volatilities over the previous month tend to have high (low) future returns. Sorting stocks ranked into decile portfolios by past call implied volatilities produces spreads in average returns of approximately 1% per month, and the return differences persist up to six months. The cross section of stock returns also predicts option implied volatilities, with stocks with high past returns tending to have call and put option contracts that exhibit increases in implied volatility over the next month, but with decreasing realized volatility. These predictability patterns are consistent with rational models of informed trading.  相似文献   
942.
Financing constraints have been found to play an important role in several aspects of firm behavior, but no attention has been given to their effects on credit ratings. In this paper we analyze a unique and comprehensive data set for US firms rated by Fitch over the period 2001–07. We employ Fitch's market implied ratings derived from bond and equity prices. The analysis finds evidence that financial variables are more important in predicting credit ratings for firms likely to face financing constraints. We conclude that the financing constraint is an important dimension in the market implied ratings process. Our findings are of relevance to managers, investors and rating agencies seeking to understand the mechanism through which financing constraints affect credit ratings.  相似文献   
943.
We posit that the benefits and costs of multiple directorships are conditional on firm characteristics. We find firm valuation is positively associated with multiple directorships in (i) firms with high advising needs and (ii) firms with high external financing needs. These beneficial effects of multiple directorships are generally stronger in countries with weak shareholder rights and in firms that are widely held. However, when controlling shareholder hold high voting‐rights to cash‐flow rights, multiple directorships reduce firm valuation, especially in countries with weak shareholder rights and in closely held firms. As multiple directorships increases, cash holdings (capital expenditures) contribute less to shareholder value. The negative association between value of cash (capital expenditure) and busy boards is mitigated in firms with (i) high advising needs, (ii) high external financing needs and (iii) less entrenched ownership structures.  相似文献   
944.
During the financial crisis, sovereign ratings have come under increased public scrutiny due to their strong impact on sovereign borrowing costs and hence financial stability of countries. However, their influence on corporations within and outside the respective nations has so far attracted only limited attention, although several academics have provided intriguing insights in this regard. In order to obtain a structured overview of this relatively young strand of research, this paper reviews key insights and conclusions that the extant literature offers on the role of sovereign creditworthiness for corporations. Herein, it focuses on the effects that have been observed for the corporate business environment, access to capital, and foreign investment activities. Different research issues providing fertile ground for future studies are identified.  相似文献   
945.
We study the relationship between investor relations disclosure and analyst forecast properties in Australian firms, a setting dominated by small firms with limited analyst coverage and requiring continuous disclosure of price sensitive information. We find increasing disclosure in the time period investigated is associated with greater accuracy in firms disclosing fewer items. Disclosure was unrelated to forecast dispersion, possibly due to the low analyst following. In periods of uncertainty, the investor relations awards effectively discriminated quality from quantity of disclosure. These findings highlight the importance of active communication with analysts, particularly in firms providing less disclosure and during periods of uncertainty.  相似文献   
946.
This article provides evidence that smaller, regional public financial intermediaries contributed to Germany's industrial development, using a new dataset of the foundation year and location of Prussian savings banks. This extends the bank–growth nexus beyond its traditional focus on large universal banks. Since savings banks were public financial intermediaries, our results further suggest that state intervention can be successful in the financial sector, particularly at the early stages of industrial development when capital requirements are manageable, and access to international capital markets is limited.  相似文献   
947.
There is a debate about whether coastal shipping experienced substantial productivity growth prior to the advent of steam power. To study changes over the long eighteenth century, this article uses thousands of coastal journey times culled from Board of Trade crew lists between 1835 and 1844 and coastal port books for the mid‐to‐late 1600s, along with a newly digitized coastal network. Comparisons between matched samples show that journey speeds, defined as miles sailed per day, were significantly higher in the crew lists compared to the port books, and that voyage cycle times, defined as days between starting two identical voyages, were substantially lower. The study also shows that voyage times in the east coast coal trade were substantially lower around 1840 than around 1700, but the difference was much smaller when peace years are compared. These new data imply that total factor productivity growth in the east coast coal trade was significant, especially if one accounts for gains from peace after 1815. The findings contribute to the larger literature studying the rate and sources of productivity growth during the industrial revolution.  相似文献   
948.
Service providers often work under serious time constraints that increase the likelihood of service failure. This study uses a dual processing model to investigate how time pressure and the conscientiousness of service providers interact to influence service failure. This study hypothesizes that time pressure is positively related to service failure for health service providers with low levels of conscientiousness, but not for those with high levels of conscientiousness. A cross-sectional design and paper-based questionnaires were used. The study hypotheses were then analyzed using regression analyses. The results of this study supported the hypotheses. Moreover, the empirical findings support the dual processing model.  相似文献   
949.
We add to an emerging body of literature on input subsidies in Africa south of the Sahara. Our analysis focuses on demand for seed, characterising smallholders with a high predicted demand for hybrid seed who were not reached by the subsidy programme. We use cross‐sectional data from the 2010 agricultural season and an instrumented control function approach to test the hypothesis that the subsidy on hybrid maize seed in Zambia is selectively biased. Consistent with other literature, we find that the subsidy is a recursive determinant of seed demand, but in 2010, its recipients had more land, more assets, and lower poverty rates. Findings illustrate the social costs of the programme as currently designed and highlight the need to build alternative supply channels if poorer maize growers are to grow hybrid seed.  相似文献   
950.
以济宁市任城区为研究对象,获取研究区域2001年、2006年和2011年三期Landsat ETM与TM影像,通过ENVI遥感影像处理软件分析了研究区影像的光谱特征以及植被归一化指数(NDVI)、建筑归一化指数(NDBI)以及水体归一化指数(NDWI),利用决策树算法确定各地类的综合阈值,建立决策树模型,得到了土地利用覆盖分类结果并取得了良好的分类精度。同时通过对研究区2001至2011年的土地利用动态度及土地利用转移矩阵的分析得出研究区在研究期内的土地利用覆盖变化特征,最终得出结论:(1)利用决策树分类能够获得较高的分类精度;(2)任城区城镇化发展迅速,城镇化在区域土地利用覆盖变化过程中起到了主导性的作用。  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