全文获取类型
收费全文 | 23044篇 |
免费 | 533篇 |
专业分类
财政金融 | 4650篇 |
工业经济 | 1829篇 |
计划管理 | 3840篇 |
经济学 | 5015篇 |
综合类 | 266篇 |
运输经济 | 164篇 |
旅游经济 | 360篇 |
贸易经济 | 3646篇 |
农业经济 | 1040篇 |
经济概况 | 2733篇 |
信息产业经济 | 2篇 |
邮电经济 | 32篇 |
出版年
2021年 | 150篇 |
2020年 | 301篇 |
2019年 | 435篇 |
2018年 | 523篇 |
2017年 | 541篇 |
2016年 | 521篇 |
2015年 | 337篇 |
2014年 | 525篇 |
2013年 | 2458篇 |
2012年 | 657篇 |
2011年 | 768篇 |
2010年 | 692篇 |
2009年 | 740篇 |
2008年 | 667篇 |
2007年 | 591篇 |
2006年 | 558篇 |
2005年 | 450篇 |
2004年 | 450篇 |
2003年 | 448篇 |
2002年 | 480篇 |
2001年 | 466篇 |
2000年 | 504篇 |
1999年 | 480篇 |
1998年 | 489篇 |
1997年 | 440篇 |
1996年 | 400篇 |
1995年 | 371篇 |
1994年 | 373篇 |
1993年 | 389篇 |
1992年 | 422篇 |
1991年 | 415篇 |
1990年 | 345篇 |
1989年 | 293篇 |
1988年 | 264篇 |
1987年 | 258篇 |
1986年 | 284篇 |
1985年 | 406篇 |
1984年 | 377篇 |
1983年 | 361篇 |
1982年 | 318篇 |
1981年 | 311篇 |
1980年 | 275篇 |
1979年 | 273篇 |
1978年 | 268篇 |
1977年 | 194篇 |
1976年 | 198篇 |
1975年 | 192篇 |
1974年 | 157篇 |
1973年 | 162篇 |
1972年 | 125篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
43.
The notion that prices impound a wide array of information, including market expectations, has led to earnings forecast models conditioned on prices. Yet, presumably, analysts' forecasts capture both public information and certain private information not previously impounded in prices. Accordingly, price-based models are seemingly an inefficient, and less effective, source of expecta-tions. This article investigates this hypothesis using financial analysts', price-based, and naive forecasts. Results indicate that analysts' forecasts (1) are at least as accurate as price-based and naive models, and (2) yield better expectations for market tests relating returns and earnings. These inferences are robust across different information environments. The evidence suggests that analysts either possess private information or are more effective information processors, or both. 相似文献
44.
Malek K. Lashgari 《Journal of Economics and Finance》1992,16(2):13-30
This paper concerns the behavior of gold and silver prices on a daily, weekly and monthly time span during January 1970 to December 1989. The methodology consists of extracting the predictive power of time series of changes in past prices for obtaining optimal forecasts for next-period changes in prices. Optimizations are made in the context of information theory via minimizing the degree of diversity between the actual and predicted changes in prices. This methodology has merit in that it does not rest on, generally speaking, unacceptable assumptions regarding the shape of the distribution, stationarity of variance or its existence. The behavior of gold and silver prices are studied during peak to trough and trough to peak of the business cycles over 1970–1989. It is generally shown that information contained in past prices of gold and silver does not allow one to predict next-period changes in prices in the short run. However, longer-term predictions are possible. This study further reveals that as the length of the time interval expands, gold prices exhibit a higher degree of dependency on past prices than silver. 相似文献
45.
Marketing’s contribution to the strategy dialogue 总被引:1,自引:1,他引:0
George S. Day 《Journal of the Academy of Marketing Science》1992,20(4):323-329
46.
Muzaffer S. 《Annals of Tourism Research》2002,29(4)
47.
Despite the importance of the London markets and the significance of the relationship for market makers, little published research is available on arbitrage between the FTSE‐100 Index futures and the FTSE‐100 European index options contracts. This study uses the put–call–futures parity condition to throw light on the relationship between options and futures written against the FTSE Index. The arbitrage methodology adopted in this study avoids many of the problems that have affected prior research on the relationship between options or futures prices and the underlying index. The problems that arise from nonsynchroneity between options and futures prices are reduced by the matching of options and futures prices within narrow time intervals with time‐stamped transaction data. This study allows for realistic trading and market‐impact costs. The feasibility of strategies such as execute‐and‐hold and early unwinding is examined with both ex‐post and ex‐ante simulation tests that take into consideration possible execution time lags for the arbitrage trade. This study reveals that the occurrence of matched put–call–futures trios exhibits a U‐shaped intraday pattern with a concentration at both open and close, although the magnitude of observed mispricings has no discernible intraday pattern. Ex‐post arbitrage profits for traders facing transaction costs are concentrated in at‐the‐money options. As in other major markets, despite important microstructure differences, opportunities are generally rapidly extinguished in less than 3 min. The results suggest that arbitrage opportunities for traders facing transaction costs are small in number and confirm the efficiency of trading on the London International Financial Futures and Options Exchange. © 2002 John Wiley & Sons, Inc. Jrl Fut Mark 22:31–58, 2002 相似文献
48.
Popular monthly coincident indices of business cycles, e.g. the composite index and the Stock–Watson coincident index, have two shortcomings. First, they ignore information contained in quarterly indicators such as real GDP. Second, they lack economic interpretation; hence the heights of peaks and the depths of troughs depend on the choice of an index. This paper extends the Stock–Watson coincident index by applying maximum likelihood factor analysis to a mixed‐frequency series of quarterly real GDP and monthly coincident business cycle indicators. The resulting index is related to latent monthly real GDP. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
49.
To date, the discussion of the Lev and Thiagarajan 1993 fundamentals in the prior literature has been exclusively in the context of the stock market. Our study is the first to examine the value‐relevance of these fundamentals for default risk. By focusing on the market for new bond issues, we examine the value‐relevance of the fundamental score using expected rather than realized returns. Also, by focusing on the bond market we provide a different perspective than that brought by prior studies relying solely on stock prices. We find the fundamentals to be priced in the market for new bond issues as indicators of expected future earnings and to be value‐relevant in enabling the market to discern differences in bond credit quality over and above the published bond ratings. 相似文献
50.
Recent approaches to sustainable development leave much room for policies at a local level. In fact, it is becoming evident that targets such as increasing resource productivity, preserving natural cycles, or extending the present level of welfare, are best pursued within the confines of a local area. In particular, environmental changes are best brought about by considering local systems of firms as cornerstones of cooperative strategies and using data on materials and energy use in physical terms. In this paper, an enterprise input–output model is developed for an industrial district, i.e. a local group of firms specialized in the production of a single final output. The model allows for a detailed quantitative analysis of materials and energy flows and the consequent generation of waste and pollution. As a planning tool, the model may be used to evaluate alternative scenarios, such as the possibility of re- using waste taking account of sustainability requirements. An empirical case study applies the model to an industrial district in Southern Italy producing leather sofas. 相似文献