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   30701篇
  免费   731篇
  国内免费   5篇
财政金融   4584篇
工业经济   1705篇
计划管理   3560篇
经济学   5283篇
综合类   380篇
运输经济   175篇
旅游经济   432篇
贸易经济   3640篇
农业经济   1253篇
经济概况   3427篇
水利工程   6941篇
信息产业经济   1篇
邮电经济   56篇
  2021年   235篇
  2020年   315篇
  2019年   479篇
  2018年   708篇
  2017年   682篇
  2016年   715篇
  2015年   404篇
  2014年   672篇
  2013年   2764篇
  2012年   1033篇
  2011年   1083篇
  2010年   790篇
  2009年   870篇
  2008年   937篇
  2007年   961篇
  2006年   851篇
  2005年   780篇
  2004年   790篇
  2003年   549篇
  2002年   601篇
  2001年   545篇
  2000年   532篇
  1999年   538篇
  1998年   474篇
  1997年   513篇
  1996年   497篇
  1995年   452篇
  1994年   448篇
  1993年   477篇
  1992年   489篇
  1991年   480篇
  1990年   416篇
  1989年   401篇
  1988年   385篇
  1987年   375篇
  1986年   367篇
  1985年   541篇
  1984年   507篇
  1983年   481篇
  1982年   440篇
  1981年   410篇
  1980年   475篇
  1979年   419篇
  1978年   350篇
  1977年   343篇
  1976年   316篇
  1975年   340篇
  1974年   281篇
  1973年   299篇
  1972年   212篇
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
951.
Risks in new product development: devising a reference tool   总被引:1,自引:0,他引:1  
This paper describes the development and applicability of a risk reference framework (RRF) for diagnosing risks in technological breakthrough projects. In contrast to existing risk identification strategies, the RRF centers on an integral perspective on risk (i.e. business, technological and organizational) and the assessment of risks in ongoing projects. The resulting RRF consists of 12 main risk categories and 142 connected critical innovation issues and has been developed for a globally operating company in the fast-moving consumer goods industry. Our analyses show that to some extent different project members identified the same risks and that saturation occurred in the number of new risk-issues brought to light. We conclude that the success of breakthrough innovation projects improves through formal risk-assessment.  相似文献   
952.
953.
We find that mutual funds located in regions with more competing funds charge lower management fees, but higher fees related to sales and distribution (12b‐1 fees), sales loads, and other nonmanagement fee expenses. There is some evidence that funds in more competitive regions have higher total expense ratios than similar funds in less competitive regions. Our results indicate that while increased competition drives down fund profits, it creates a negative externality by way of increased sales expenses. Overall, our results suggest the mutual fund industry is characterized by monopolistic competition determined at the local level.  相似文献   
954.
The wide fluctuations of oil prices from 2003 to 2008 have attracted the interest of academics and policymakers. A popular view is that these fluctuations were caused by speculative bubbles due to the increased financialization of oil futures markets. This hypothesis, however, is difficult to examine since the fundamental price of oil is unobservable and, therefore, econometric evidence in favor of bubbles may actually be due to misspecified market fundamentals. In this paper, we extend two recently proposed methodologies for bubble detection that alleviate this problem by using market expectations of future prices. Both methodologies provide no evidence of speculative bubbles.  相似文献   
955.
The literature has long agreed that the DMP model (after Diamond 1982, Mortensen 1982, Pissarides 1985) with search and matching frictions in the labor market can deliver large volatilities in labor market quantities, consistent with empirical data, only if there is at least some wage stickiness. I show, however, that the model can deliver nontrivial volatilities without wage stickiness, as long as it has price dispersion and nonzero long‐run inflation rates. I find that by keeping inflation at a positive rate, monetary policy may be accountable for the large standard deviations observed on labor market variables. In addition, the Shimer (2005) puzzle disappears under monetary policy shocks.  相似文献   
956.
This study examines whether firms engage in income-decreasing real earnings management before open market stock repurchases to reduce the cost of stock buybacks. In the short run, managers have the ability to underproduce inventory and increase discretionary expenditures, thus decreasing current period earnings. We find that managers engage in both of these activities before repurchasing their firms’ shares, especially the latter. Also, companies increase their discretionary spending before making repurchases to a greater extent following the passage of the Sarbanes–Oxley Act of 2002 as well as when they are financially healthy and have high marginal tax rates. Finally, we document that firms with the most income-decreasing real earnings management experience the largest positive abnormal returns during the subsequent period. Our findings highlight the importance of considering firms’ use of real operating decisions, as opposed to just opportunistic disclosure practices, around significant corporate events, such as the repurchase of their own stock.  相似文献   
957.
This paper examines the disclosures made on English credit unions’ websites. Credit unions without a website are presumed to be small. Community credit unions with websites tend to offer basic services with a limited range of products that may appeal to poorer members of society. Occupational credit unions appear more likely to have a greater range of products.  相似文献   
958.
Expert judgement is pervasive in all forms of risk analysis, yet the development of tools to deal with such judgements in a repeatable and transparent fashion is relatively recent. This work outlines new findings related to an approach to expert elicitation termed the IDEA protocol. IDEA combines psychologically robust interactions among experts with mathematical aggregation of individual estimates. In particular, this research explores whether communication among experts adversely effects the reliability of group estimates. Using data from estimates of the outcomes of geopolitical events, we find that loss of independence is relatively modest and it is compensated by improvements in group accuracy.  相似文献   
959.
Variable annuities are insurance products that contain complex guarantees. To manage the financial risks associated with these guarantees, insurance companies rely heavily on Monte Carlo simulation. However, using Monte Carlo simulation to calculate the fair market values of these guarantees for a large portfolio of variable annuities is extremely time consuming. In this article, we propose the class of GB2 distributions to model the fair market values of guarantees to capture the positive skewness typically observed empirically. Numerical results are used to demonstrate and evaluate the performance of the proposed model in terms of accuracy and speed.  相似文献   
960.
Academics and practitioners frequently highlight that overall market and industry performance is an important aspect of a firm’s profitability. However, few studies allow for the decomposition of a firm’s profitability into market, industry, and idiosyncratic components, and those that do often assume that the market and industry components are cross-sectional constants. In this study, we allow for variation in firm-specific sensitivities to market, industry, and idiosyncratic economic shocks, and then assess whether and when this decomposition results in improved forecasts of profitability. For the overall sample, we find significant improvements in terms of the magnitude of forecast errors and the frequency with which forecasts based on the decomposed values are superior versus forecasts using only total profitability. Across the sample as a whole, decomposing profitability in the forecasting process results in more accurate forecasts greater than two-thirds of the time (increasing to almost 80% within certain subsamples). Our results provide strong support for the role that firm-specific measures of market and industry profitability play in predicting a firm’s future performance, as well as highlighting settings where the decomposition provides the greatest benefit in terms of predicting future changes in profitability.  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