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   25129篇
  免费   477篇
  国内免费   1篇
财政金融   4808篇
工业经济   1786篇
计划管理   3718篇
经济学   5487篇
综合类   396篇
运输经济   197篇
旅游经济   458篇
贸易经济   3847篇
农业经济   1336篇
经济概况   3516篇
信息产业经济   1篇
邮电经济   57篇
  2021年   138篇
  2020年   258篇
  2019年   423篇
  2018年   504篇
  2017年   527篇
  2016年   539篇
  2015年   300篇
  2014年   552篇
  2013年   2587篇
  2012年   730篇
  2011年   826篇
  2010年   692篇
  2009年   781篇
  2008年   750篇
  2007年   660篇
  2006年   604篇
  2005年   506篇
  2004年   546篇
  2003年   489篇
  2002年   539篇
  2001年   469篇
  2000年   484篇
  1999年   468篇
  1998年   426篇
  1997年   437篇
  1996年   438篇
  1995年   370篇
  1994年   379篇
  1993年   423篇
  1992年   421篇
  1991年   417篇
  1990年   340篇
  1989年   312篇
  1988年   302篇
  1987年   315篇
  1986年   320篇
  1985年   485篇
  1984年   453篇
  1983年   419篇
  1982年   394篇
  1981年   355篇
  1980年   406篇
  1979年   324篇
  1978年   282篇
  1977年   273篇
  1976年   206篇
  1975年   252篇
  1974年   201篇
  1973年   192篇
  1972年   138篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
52.
We provide evidence on the impact of tax incentives and financial constraints on corporate R&D expenditure decisions. We contribute to extant research by comparing R&D expenditures in the United States and Canada, thereby exploiting the differences in the two countries' R&D tax credit mechanisms and generally accepted accounting principles. The two tax incentive mechanism designs are consistent with differing views of the degree of financial constraints faced by firms in these economies. Our sample also allows us to explore the effects of capitalizing R&D on Canadian firms. Employing a matched design, we document relations between tax credit incentives and R&D spending consistent with both Canadian and U.S. public companies responding as though they are not financially constrained. We estimate that the Canadian credit system induces, on average, $1.30 of additional R&D spending per dollar of taxes forgone while the U.S. system induces, on average, $2.96 of additional spending. We also find that firms that capitalize R&D costs in Canada spend, on average, 18 percent more on R&D. Collectively, this evidence is important to the ongoing debates in both countries concerning the appropriate design of incentives for R&D and is consistent with the assumptions found in the U.S. tax credit system, but not those found in the Canadian system.  相似文献   
53.
54.
This paper examines the long-run relationship between short-term and long-term interest rates (both nominal and real) in 19 countries, and explores the possibility that the relationship is statistically stable using Lc, MeanF, and SupF statistics suggested by Hansen [1992]. Empirical results obtained from various cointegration techniques (Johansen, Phillips and Hansen, Stock and Watson, and Park) and quarterly data (1973–1998) show considerable support for the expectations hypothesis in all countries (except the United Kingdom). In a majority of cases, it is also found that a stable relationship exists between the short-term and long-term interest rates.  相似文献   
55.
In horticultural markets, trade barriers often apply to the processed products whereas domestic support applies to farm-produced raw commodities. Here we assess the effects of such trade barriers and domestic support by simulating the effects of policy reform on global processing tomato markets, which are faced with modest processed product tariffs and high domestic support in the European Union (EU). Both protection and EU subsidy drive down world welfare, but we find that reducing import tariffs for tomato products would yield greater effects on markets and larger welfare impacts outside Europe than would reductions in EU domestic support.  相似文献   
56.
The paper presents a technique developed by the authors, which makes it possible to determine the necessary amount of financing for education at all the budget system levels for 2008-2010, based on the Russian average value of financing, taking into account the budget expenditures index for two variants of student population, i.e. the actual number of on-budget students and the number of students required to meet the economy’s need for trained workers. The technique was developed and the calculations were made on the basis of Russian long-term forecasts and the Russian three-year federal budget for 2008–2010.  相似文献   
57.
58.
Traditional methods of estimating market volatility use daily return observations from a stock index to calculate monthly variance. We break with tradition and estimate stock market volatility using the daily, cross-sectional standard deviation of returns for all firms trading on the New York Stock Exchange and the American Stock Exchange. We find a significantly positive relation between risk and return. Market volatility is estimated to be about half the volatility level previously reported. The intraday, cross-sectional market volatility measure provides findings consistent with risk-return theory.  相似文献   
59.
60.
This article provides empirical evidence on the intraday relation between spot volatility and trading volume in the Spanish stock index futures market. GARCH methodology is used to estimate spot volatility. We analyze the potential relation between spot and futures trading volume and spot volatility by estimating the corresponding conditional density functions as proposed in Quah (1997). Our results reveal no significant link between those variables. Similar findings arise when expected and unexpected volume is considered. Our results suggest that derivative market is not a force behind episodes of significant spot jump volatility. © 2003 Wiley Periodicals, Inc. Jrl Fut Mark 23:841–858, 2003  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