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   1921篇
  免费   55篇
财政金融   304篇
工业经济   156篇
计划管理   401篇
经济学   424篇
综合类   16篇
运输经济   17篇
旅游经济   25篇
贸易经济   372篇
农业经济   59篇
经济概况   199篇
邮电经济   3篇
  2023年   11篇
  2022年   16篇
  2021年   22篇
  2020年   27篇
  2019年   47篇
  2018年   63篇
  2017年   55篇
  2016年   98篇
  2015年   57篇
  2014年   98篇
  2013年   273篇
  2012年   88篇
  2011年   92篇
  2010年   97篇
  2009年   85篇
  2008年   67篇
  2007年   73篇
  2006年   46篇
  2005年   40篇
  2004年   35篇
  2003年   45篇
  2002年   40篇
  2001年   26篇
  2000年   44篇
  1999年   45篇
  1998年   36篇
  1997年   27篇
  1996年   16篇
  1995年   21篇
  1994年   25篇
  1993年   23篇
  1992年   12篇
  1991年   15篇
  1990年   10篇
  1989年   11篇
  1988年   8篇
  1987年   10篇
  1986年   14篇
  1985年   16篇
  1984年   18篇
  1983年   14篇
  1982年   11篇
  1981年   13篇
  1980年   11篇
  1979年   8篇
  1978年   14篇
  1977年   6篇
  1976年   6篇
  1973年   4篇
  1972年   7篇
排序方式: 共有1976条查询结果,搜索用时 10 毫秒
51.
Severe socio-economic issues that threaten peace, life or wellbeing of humans in specific regions of the world cannot be solved by any single actor. Wide networks of political, business, governmental, non-profit and humanitarian organizations are to be involved to change existing practices. Despite conflicting interests and competing behavior, involved organizations need to act collectively to initiate the change of commonly accepted practices, i.e. institutions. This is the space in the present study for examining network mobilization as a collective means to change institutions. Our aim is to answer the question: How are networks mobilized in crisis management to initiate institutional change processes in socio-economically turbulent contexts? We provide a framework of network mobilization for institutional change built on the IMP rooted network mobilization research and institutional entrepreneurship discussion. The framework is reflected upon by means of insights from an interview-based case study with representatives of governmental and non-governmental organizations involved in worldwide humanitarian peace-building. We identify, firstly, incentivizing, reticent and adaptational behaviors of network mobilizers to utilize legitimacy and relationship sediments as mobilization enablers. Secondly, these behaviors help network mobilizers to overcome actor visibility and unpredictability as mobilization obstacles in turbulent contexts.  相似文献   
52.
Firms developing new products often face the challenge of making investment decisions under uncertain input–cost conditions due to the price volatilities of the materials they use. These decisions need to be made long before the final products are launched on the market. Therefore, firms that invest in the opportunity to switch materials in a timely manner will have the flexibility to react to material price changes and realize competitive advantages. However, volatile material prices may also cause a firm to delay investment. Using real‐options reasoning, this paper studies the influence of input‐cost fluctuations on the timing decision to start new product development (NPD) and thus create the follow‐on opportunity to later replace an existing product. A model that combines waiting and switching options to derive influencing factors of the flexibility value that triggers the investment is developed and tested on a sample of material substitution projects from manufacturing firms. The results show how price uncertainty of the new and the old material, their joint price development, the expected project duration, and competitive preemption are related to the propensity to delay the start of NPD. The findings provide new insights on how timing in adopting materials can be used to hedge exposure to volatile material prices. The insights are relevant for adopters and producers of new materials, as well as for policy makers who strive for supporting the diffusion of new materials.  相似文献   
53.
In this paper the incentives for platform sponsors to open up their networks for independent rivals is analyzed. It is shown that open access may increase the platform sponsors’ profit levels and enhance quality improving investments. In addition, it is shown that a commitment to allow entry reduces the difference between ex ante and ex post compatibility incentives.  相似文献   
54.
This paper resolves two issues regarding the traditional capital asset pricing model with one risk-free asset which seem to have been overlooked in the literature. First, it provides an elementary and complete proof of the two-fund separation theorem which accounts for the fact that asset demand may become undefined if the limiting slopes of the investor’s indifference curves are finite. Second, it shows that an additional limiting condition on investors’ risk aversions is generally necessary to guarantee existence of an equilibrium. Moreover, a generalized existence result is formulated which includes investors who in equilibrium may not invest in risky assets and a simple condition ensuring positive equilibrium asset prices is given.  相似文献   
55.
Classifications of futures research are usually based on epistemological differences, but we complete these with ontological considerations. The article presents a typology of forecasts, i.e. statements on future events or states. It has two dimensions, truth claim and explanatory claim; each dimension has two values, making the claim or not making the claim. The four outcomes are: forecasts which make both truth claims and explanatory claims (predictions); forecasts which make truth claims, but not explanatory claims (prognoses); forecasts which make explanatory claims, but not truth claims (science fiction); and forecasts which make neither truth claims nor explanatory claims (utopias or dystopias). We regard each outcome as an ideal type, against which forecasts can be measured. We illustrate the use of the typology by presenting an example of each outcome.  相似文献   
56.
This paper analyzes the effect of transport subsidies on the spatial expansion of cities, asking whether such subsidies are a source of undesirable urban sprawl. Even though the cost-reducing effect of transport subsidies is offset by a higher general tax burden (which reduces the demand for space), the analysis shows that subsidies nevertheless lead to spatial expansion of cities. If the transport system exhibits constant returns to scale, the subsidies are inefficient, making the urban expansion they entail undesirable. The paper also studies transport “system choice,” with the city portrayed as selecting its transport system from along a continuum of money cost/time cost choices. The analysis shows that subsidies inefficiently bias choice in the direction of a high money cost/low time cost option. Lastly, the paper considers system choice in a city with rich and poor groups, showing that the rich favor a system with a high money cost and low time cost, but that their choice, if implemented, leads to a city whose spatial size is smaller than optimal. Thus, rich control of system choice does not lead to urban sprawl.  相似文献   
57.
We consider the question whether top tennis players in a top tournament (Wimbledon) employ an optimal (efficient) service strategy. While we show that top players do not, in general, follow an optimal strategy, our principal result is that the estimated inefficiencies are not large: the inefficiency regarding winning a point on service is on average 1.1% for men and 2.0% for women, implying that–by adopting an efficient service strategy–players can (on average) increase the probability of winning a match by 2.4%-points for men and 3.2%-points for women. While the inefficiencies may seem small, the financial consequences for the efficient player at Wimbledon can be substantial: the expected paycheck could rise by 18.7% for men and even by 32.8% for women. We use these findings to shed some light on the question of whether economic agents are successful optimizers.  相似文献   
58.
Conferences are an important element in the work of researchers, requiring substantial investments in fees, travel expenses and the time spent by the participants. The aim of this paper is to identify the preferences of participants with respect to conference characteristics. Based on a sample of European labour economists, preferences are measured using the vignette approach where participants are asked to choose between hypothetical European Association of Labour Economists (EALE) conferences. We find that the keynote speakers are the most important element in the preference for a conference, followed by the location of the conference. There is substantial heterogeneity in the taste of labour economists especially with respect to location, though the link between preference parameters and measured characteristics like gender, age and seniority is limited. Factor analysis suggests that the variety in preferences can be best described by a latent variable that reflects the weights people put on content versus fun.  相似文献   
59.
In this article, we identify critical success factors for managing small and intensive purchasing groups by comparing successful and unsuccessful purchasing groups in a large-scale survey. The analysis of our data set suggests the following success factors: no enforced participation, sufficient total contribution of efforts, all members contribute with knowledge, continuity in member representation, communication, and fair allocation of savings. The findings suggest among other things that it is important that after a voluntary decision has been taken to cooperate, the members need to show that they are committed. Other factors such as interorganisational trust and formal structures are important when establishing interorganisational cooperation, but should otherwise be considered as necessary yet not sufficient in the management phase of a successful purchasing group.  相似文献   
60.
Abstract.  In addition to standard methods of environmental valuation, a novel approach has recently emerged which models individuals' self-rated happiness as a function of their incomes and the prevailing environmental conditions. The estimated relationship is used to calculate the trade-off people would be willing to make between income and environmental conditions, i.e. the increase in income necessary to compensate individuals for any given decline in environmental quality. While the basic idea is simple, the theoretical and empirical details may be complex, and they may vary from application to application. This paper discusses the relevant conceptual and methodological issues and reviews applications to air and water pollution, noise nuisance, climate parameters, and natural hazards.  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