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   133743篇
  免费   3813篇
  国内免费   1篇
财政金融   25622篇
工业经济   11080篇
计划管理   21587篇
经济学   29072篇
综合类   1449篇
运输经济   960篇
旅游经济   2497篇
贸易经济   22252篇
农业经济   6082篇
经济概况   16708篇
信息产业经济   8篇
邮电经济   240篇
  2021年   832篇
  2020年   1639篇
  2019年   2394篇
  2018年   2360篇
  2017年   2516篇
  2016年   2707篇
  2015年   2103篇
  2014年   3412篇
  2013年   15346篇
  2012年   4208篇
  2011年   4154篇
  2010年   3698篇
  2009年   4309篇
  2008年   3876篇
  2007年   3232篇
  2006年   3560篇
  2005年   3539篇
  2004年   3124篇
  2003年   2877篇
  2002年   2850篇
  2001年   2613篇
  2000年   2564篇
  1999年   2450篇
  1998年   2325篇
  1997年   2257篇
  1996年   1944篇
  1995年   1949篇
  1994年   1951篇
  1993年   1921篇
  1992年   1937篇
  1991年   1857篇
  1990年   1711篇
  1989年   1566篇
  1988年   1505篇
  1987年   1520篇
  1986年   1593篇
  1985年   2349篇
  1984年   2234篇
  1983年   2053篇
  1982年   1898篇
  1981年   1877篇
  1980年   1830篇
  1979年   1757篇
  1978年   1588篇
  1977年   1578篇
  1976年   1354篇
  1975年   1238篇
  1974年   1163篇
  1973年   1150篇
  1972年   863篇
排序方式: 共有10000条查询结果,搜索用时 724 毫秒
141.
142.
143.
Research Summary: This study addresses a theoretical dilemma regarding how alliance network constraint (reflected by network cohesion) affects a firm’s alliance formation with new partners. Using a network pluralism approach, we separate a firm’s ego alliance network into two activity‐based networks—an exploratory network and an exploitative network—based on the primary value chain activity involved in each alliance. We argue that the cohesion of exploratory or exploitative networks has an inverted U‐shaped effect on the addition of new partners in the same activity‐based network, and a positive effect on the addition of new partners in the other network. Results based on data from the biotechnology industry largely support our predictions with one exception. Our study contributes to both scholarly understanding of network embeddedness and alliance practice. Managerial Summary: The structure of firms’ ongoing alliance networks may have paradoxical implications for their efforts to search for and form alliance with new partners. That is, when a firm’s alliance partners are tightly connected with each other, the cohesive network tends to both encourage and impede the focal firm to add new partners. We resolve this dilemma by showing that when a firm is deeply entrenched in a cohesive alliance network conducting a certain type of activities (e.g., R&D activities), it may not easily add new R&D alliance partners. However, it may still be able to escape from the cohesive R&D alliance network by seeking new partners conducting other activities (e.g., manufacturing activities).  相似文献   
144.
Following the animal spirits theory proposed by Akerlof and Shiller, this article contributes to behavior economics by investigating the possibility of using auction sales data to capture evidence of irrational exuberance in the housing market. Using the monthly percentages of residential property auction sales for Auckland, Wellington and Christchurch regions in New Zealand from 2006 to 2015, and the exuberance testing method proposed by Phillips, Shi and Yu, we find that animal spirits have been developing in the Auckland housing market since 2013, but not in other regions. When compared to the results based on price‐to‐rent ratios, auction sales provide more meaningful results for identifying market‐wide irrational exuberance at an early stage. The causality test on price‐to‐rent ratios and auction sales volume shows that asset prices and animal spirits influence each other in the short run. In the long run, prices have significant effect on animal spirits, but not vice versa.  相似文献   
145.
This paper presents the case for and the evidence in favour of passive investment strategies and examines the major criticisms of the technique. I conclude that the evidence strongly supports passive investment management in all markets—small–capitalisation stocks as well as large–capitalisation equities, US markets as well as international markets, and bonds as well as stocks. Recent attacks on the efficient market hypothesis do not weaken the case for indexing.  相似文献   
146.
The present paper was inspired by and is a response to the Rola-Rubzen, Hardaker and Dillon paper 'Agricultural economists and world poverty: progress and prospects' (Rola-Rubzen et al. 2001). It is agreed that the position of agricultural economists in foreign aid and poverty programs has declined over recent decades. Such a feeling of guilt and remorse expressed by the above authors does indeed create considerable 'angst'. A major reason for this state of affairs lies in 'the flavour of the month' approach of the development agencies. These include women in development, gender-based farming systems research, household nutrition and food security, people participation, and targeting the poorest of the poor. These fads have driven disciplinary considerations to the wall and the more widely-defined objectives have reduced the drive for economic efficiency. We argue there is still a place for better designed and delivered assistance programs within the wider framework of assistance that has become fashionable. Greater application of institutional principles in both the political processes associated with assistance and the implementation agencies would improve the outcomes of many projects. Particular attention would need to be given to the interface between the development agencies and recipient governments. The present paper picks up on the market failure aspects of agriculture's rather poor contribution to development, and develops a wider perspective in terms of the new institutional economics and a continuing role for the agricultural economist.  相似文献   
147.
148.
Major tax reform to simplify the UK tax system is possible. Merging income taxes, social security taxes and corporation tax into only a single flat-rate of tax on all incomes would be a radical start. Avoiding taxes on income and expenditure which are 'too high' requires major reductions in government spending, mainly on the welfare state. Given the political will, over a period of years we really can hugely improve the UK tax system.  相似文献   
149.
The decline in private health insurance coverage over the period 1989–95 is analysed using the ABS National Health Surveys. Individuals' health status and health risk behaviours are found to be significant determinants of their decision to purchase private health insurance. At a point in time, the pool of the insured is very heterogeneous, with a mix of both good and bad health risks. It is found that the decline in insurance coverage over the period 1989–95 coincided with an increase in the degree of 'adverse selection' within the insured population.  相似文献   
150.
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