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   37612篇
  免费   676篇
  国内免费   1篇
财政金融   6600篇
工业经济   2566篇
计划管理   6320篇
经济学   8317篇
综合类   821篇
运输经济   218篇
旅游经济   360篇
贸易经济   7580篇
农业经济   1102篇
经济概况   3764篇
信息产业经济   46篇
邮电经济   595篇
  2023年   126篇
  2021年   195篇
  2020年   334篇
  2019年   445篇
  2018年   2752篇
  2017年   2572篇
  2016年   1761篇
  2015年   451篇
  2014年   649篇
  2013年   2272篇
  2012年   1200篇
  2011年   2843篇
  2010年   2545篇
  2009年   2318篇
  2008年   2270篇
  2007年   2567篇
  2006年   797篇
  2005年   989篇
  2004年   980篇
  2003年   1110篇
  2002年   766篇
  2001年   527篇
  2000年   516篇
  1999年   414篇
  1998年   415篇
  1997年   392篇
  1996年   350篇
  1995年   320篇
  1994年   298篇
  1993年   306篇
  1992年   285篇
  1991年   289篇
  1990年   263篇
  1989年   209篇
  1988年   188篇
  1987年   208篇
  1986年   210篇
  1985年   290篇
  1984年   274篇
  1983年   252篇
  1982年   215篇
  1981年   214篇
  1980年   204篇
  1979年   199篇
  1978年   178篇
  1977年   123篇
  1976年   141篇
  1975年   97篇
  1974年   102篇
  1973年   105篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
141.
This paper reports on a questionnaire survey about share valuation practices among investors and their intermediaries in Saudi Arabia. The findings suggest that fundamental analysis is used most by investor respondents where a P/E multiple is applied to an earnings forecast to generate a prediction of future price. However, technical analysis is also used to a much greater extent than in developed markets. Finally, the results indicate that quarterly and annual reports as well as newspapers are widely consulted by investors when forming their expectations about share valuations.  相似文献   
142.
Ohne Zusammenfassung Dipl.-Ing. (univ.) Michael Belau ist Director und Head of Rental Management Dipl.-Wirtschaftsing. (FH) Michael Schildger ist Vice President und Head of Finance Dr. Verena Sturm ist Manager Corporate Real Estate Services  相似文献   
143.
144.
As the elderly population of the United States grows in absolute number and as a proportion of total population, accurate projections of that population become increasingly important for sound policy decisions. Cohort component techniques are typically used for state and local projections of the elderly population, but are often outdated or even nonexistent for many local areas. This paper suggests an alternative approach, based on Medicare data and simple projection techniques. Projections for several base periods and projection horizons are made for all states and for counties in Florida and are compared with actual Medicare enrollment. On the basis of these comparisons it appears that Medicare data and simple projection techniques can produce very useful short-run projections of the elderly population for states and local areas.  相似文献   
145.
Because the break-up of conglomerates typically produces substantial increases in shareholder wealth, many commentators have argued that the conglomerate form of organization is inefficient. This article reports the findings of a number of recent academic studies, including the authors' own, that examine the causes and consequences of corporate diversification. Although theoretical arguments suggest that corporate diversification can have benefits as well as costs, several studies have documented that diversified firms trade at a significant discount from their single-segment peers. Estimates of this discount range from 10–15% of firm value, and are larger for “unrelated” diversification than for “related” diversification. If corporate diversification has generally been a value-reducing managerial strategy, why do firms remain diversified? One possibility, which the authors label the “agency cost” hypothesis, is that top executives without substantial equity stakes may have incentives to maintain a diversification strategy even if doing so reduces shareholder wealth. But, as top managers' ownership stakes increase, they bear a greater fraction of the costs associated with value-reducing policies and are therefore less likely to take actions that reduce shareholder wealth. Also, to the extent that outside blockholders monitor managerial behavior, the agency cost hypothesis predicts that diversification will be less prevalent in firms with large outside blockholders. Consistent with this argument, the authors find that companies in which managers own a significant fraction of the firm's shares, and in which blockholders own a large fraction of shares, are significantly less likely to be diversified. If agency problems lead managers to maintain value-reducing diversification strategies, what is it that leads some of these same firms to refocus? The agency cost hypothesis predicts that managers will reduce diversification only if pressured to do so by internal or external mechanisms that reduce agency problems. Consistent with this argument, the authors find that decreases in diversification appear to be precipitated by market disciplinary forces such as block purchases, acquisition attempts, and management turnover.  相似文献   
146.
This study examines the influence of day-of-the-week patterns in security returns on long-run IPO underperformance. Comparisons are made between the IPOs in Ritter's [20] database, and a constructed set of matching firms based on SIC code and size, using NYSE, AMEX, and NASDAQ securities. It is found that virtually all of the IPO underperformance occurs on Mondays and Tuesdays and that the degree of underperformance significantly differs from other days. Thus, a common explanation may exist for the general day-of-the-week pattern in security returns and IPO long-run underperformance.  相似文献   
147.
An effective R&D organization needs information from a complex web of sources, including customers, suppliers, sales and marketing, and company management. Within the R&D organization, information must flow into and among numerous teams. This network of interpersonal communications can go a long way toward determining the success of a company's innovation efforts. In an exploratory study of a Belgian company operating in the telecommunications industry, Rudy K. Moenaert and Filip Caeldries examine the effects of interpersonal communication on market and technological learning in R&D. Trying to improve the flow of information into and within its R&D organization, this company designed its new R&D facility with an eye toward improving both market and technological learning throughout the organization. By locating R&D personnel in closer proximity to one another, management hoped to provide them with improved access to market and technological information, and thus increase their innovativeness. Contrary to expectations, placing R&D professionals in closer proximity to one another did not increase technological learning in this organization. In fact, technological learning actually decreased slightly during the period studied, though the change is not statistically significant. On the other hand, market learning and product innovativeness improved significantly during the period studied. For an R&D professional in this company, members of other R&D teams seem to be more important as sources of market information than as sources of technological information. Surprisingly, the relocation of R&D personnel also did not increase the amount of communication that takes place, either within a project team, between members of different teams, or between R&D professionals and the management steering committee. However, the architectural redesign does appear to have improved the quality of communication. R&D team leaders report that since the relocation, the information flowing into R&D has been more customer focused. This is attributed to the company's ongoing efforts to provide the tools and structures necessary for supporting the objectives of the architectural redesign. For example, implementation of quality function deployment (QFD) has helped innovation team members to focus more clearly on relevant information. The success of the architectural design required approaching this effort as a complex, ongoing process, rather than a quick-fix solution.  相似文献   
148.
149.
Medic (Medicago spp.) pastures are widely grown in rotation with dryland cereal crops in Mediterranean climate zones of Australia. Attempts since the 1960's to introduce this system to Mediterranean west Asia and north Africa (the native region of medic) have not lead to significant adoption; farmers in the region recognize medic, but as a weed and natural pasture plant. This first detailed economic evaluation of the rotational medic system was conducted using a whole-farm linear programming model based on the agricultural system of north-west Syria. The model represents in detail impacts of rotation on yields, labor requirements of alternative farm activities, availability of family and hired labor, subsistence income requirements, livestock feed sources and uses at different times and a choice of sheep stocking rates. Biological data for the analysis are based on a large six-year cropping and grazing experiment near Aleppo on terra-rossa soil with rainfall mainly in winter and averaging about 330 mm annually. The trial compared a dryland medic-wheat system and traditional two-year rotations of wheat with: fallow, watermelon, lentil and vetch. Results indicate that, given current prices and yields from the trial, medic is less profitable than traditional rotations. The model was used to investigate situations in which medic would be economically preferred. Selection of a medic rotation by the model was found to be particularly sensitive to the area of the farm and the price of labor. On small farms, labor availability per hectare is high, favouring the production of labor intensive crops such as lentil and watermelon. On larger farms, labor costs of these enterprises are substantial, increasing the relative profitability of medic, especially if labor prices increase. Interestingly, the relative desirability of medic is more sensitive to its impact on subsequent wheat crops than to the level of pasture production. We also found that modest increases in the prices of sheep products (especially milk) have a major impact on the economic performance of medic. These insights will allow improved focusing and targeting of future research and extension activities.  相似文献   
150.
Deregulation     
  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