全文获取类型
收费全文 | 1284篇 |
免费 | 48篇 |
专业分类
财政金融 | 226篇 |
工业经济 | 66篇 |
计划管理 | 261篇 |
经济学 | 313篇 |
综合类 | 10篇 |
运输经济 | 15篇 |
旅游经济 | 7篇 |
贸易经济 | 339篇 |
农业经济 | 16篇 |
经济概况 | 52篇 |
邮电经济 | 27篇 |
出版年
2023年 | 6篇 |
2022年 | 14篇 |
2021年 | 22篇 |
2020年 | 27篇 |
2019年 | 43篇 |
2018年 | 53篇 |
2017年 | 59篇 |
2016年 | 70篇 |
2015年 | 56篇 |
2014年 | 72篇 |
2013年 | 132篇 |
2012年 | 100篇 |
2011年 | 84篇 |
2010年 | 72篇 |
2009年 | 77篇 |
2008年 | 66篇 |
2007年 | 74篇 |
2006年 | 36篇 |
2005年 | 39篇 |
2004年 | 32篇 |
2003年 | 30篇 |
2002年 | 18篇 |
2001年 | 15篇 |
2000年 | 19篇 |
1999年 | 5篇 |
1998年 | 18篇 |
1997年 | 11篇 |
1996年 | 13篇 |
1995年 | 7篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1979年 | 3篇 |
1977年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1970年 | 1篇 |
1969年 | 2篇 |
1968年 | 2篇 |
1967年 | 6篇 |
1966年 | 4篇 |
1964年 | 2篇 |
排序方式: 共有1332条查询结果,搜索用时 0 毫秒
31.
Maziar Sahamkhadam Andreas Stephan Ralf Östermark 《International Journal of Forecasting》2018,34(3):497-506
This study uses GARCH-EVT-copula and ARMA-GARCH-EVT-copula models to perform out-of-sample forecasts and simulate one-day-ahead returns for ten stock indexes. We construct optimal portfolios based on the global minimum variance (GMV), minimum conditional value-at-risk (Min-CVaR) and certainty equivalence tangency (CET) criteria, and model the dependence structure between stock market returns by employing elliptical (Student- and Gaussian) and Archimedean (Clayton, Frank and Gumbel) copulas. We analyze the performances of 288 risk modeling portfolio strategies using out-of-sample back-testing. Our main finding is that the CET portfolio, based on ARMA-GARCH-EVT-copula forecasts, outperforms the benchmark portfolio based on historical returns. The regression analyses show that GARCH-EVT forecasting models, which use Gaussian or Student- copulas, are best at reducing the portfolio risk. 相似文献
32.
The implementation of smart meters in German households by 2032 is a major step in the transition towards an intelligent and connected energy system. Despite of federal legislation providing a structured plan for the nationwide smart meter rollout including basic product requirements, actors within the energy market have the opportunity to take an active part in shaping the market through appealing product offers and hence to create competitive advantage. This study identifies relevant features of smart meters from literature und business practice, and measures customer’s preferences for these features. Results indicate predominantly positive customer evaluations of smart meter features, amongst which the availability of consumption data, the installation price and rental charges as well as time variable tariffs contribute most to overall utility of smart meters. Finally, findings suggest targeting customers by defining strategies to address privacy concerns, to educate about saving potentials as well as to create differentiated pricing schemes. 相似文献
33.
Adrian Payne Pennie Frow Andreas Eggert 《Journal of the Academy of Marketing Science》2017,45(4):467-489
The customer value proposition (CVP) has a critical role in communicating how a company aims to provide value to customers. Managers and scholars increasingly use CVP terminology, yet the concept remains poorly understood and implemented; relatively little research on this topic has been published, considering the vast breadth of investigations of the value concept. In response, this article offers a comprehensive review of fragmented CVP literature, highlighting the lack of a strong theoretical foundation; distinguishes CVPs from related concepts; proposes a conceptual model of the CVP that includes antecedents, consequences, and moderators, together with several research propositions; illustrates the application of the CVP concept to four contrasting companies; and advances a compelling agenda for research. 相似文献
34.
As increased stakeholder pressure requires companies to be transparent about their CSR practices, it is essential to know how reliable corporate disclosure mechanisms are, testing the gap between corporate social responsibility claims and actual practice. This study benchmarks corporate social responsibility policies and practices of ten international hotel groups of particular importance to the European leisure market. We found that corporate systems are not necessarily reflective of actual operations, environmental performance is eco-savings driven, labour policies aim to comply with local legislation, socio-economic policies are inward looking with little acceptance of impacts on the destination, and customer engagement is limited. Generally larger hotel groups have more comprehensive policies but also greater gaps in implementation, while the smaller hotel groups focus only on environmental management and deliver what they promised. As the first survey of its kind in tourism, both the methodology and the findings have implications for further research. 相似文献
35.
During the last decades Norwegian exporters have–despite various forms of exchange rate targeting–faced a rather volatile exchange rate which may have influenced their behaviour. Recently, the shift to inflation targeting and a freely floating exchange rate has brought about an even more volatile exchange rate. We examine the causal link between export performance and exchange rate volatility across different monetary policy regimes within the cointegrated Vector Autoregression (VAR) framework using the implied conditional variance from a Generalized Autoregressive Conditional Heteroskedasticity (GARCH) model as a measure of volatility. Although treating the volatility measure as either a stationary or a nonstationary variable in the VAR, we are not able to find any evidence suggesting that export performance has been significantly affected by exchange rate uncertainty. We find, however, that volatility changes proxied by blip dummies related to the monetary policy change from a fixed to a managed floating exchange rate and the Asian financial crises during the 1990s enter significantly in a dynamic model for export growth–in which the level of relative prices and world market demand together with the level of exports constitute a significant cointegration relationship. A forecasting exercise on the dynamic model rejects the hypothesis that increased exchange rate volatility in the wake of inflation targeting in the monetary policy has had a significant impact on export performance. 相似文献
36.
Economic Analysis for the UK National Ecosystem Assessment: Synthesis and Scenario Valuation of Changes in Ecosystem Services 总被引:1,自引:0,他引:1
Ian J. Bateman Amii R. Harwood David J. Abson Barnaby Andrews Andrew Crowe Steve Dugdale Carlo Fezzi Jo Foden David Hadley Roy Haines-Young Mark Hulme Andreas Kontoleon Paul Munday Unai Pascual James Paterson Grischa Perino Antara Sen Gavin Siriwardena Mette Termansen 《Environmental and Resource Economics》2014,57(2):273-297
We combine natural science modelling and valuation techniques to present economic analyses of a variety of land use change scenarios generated for the UK National Ecosystem Assessment. Specifically, the agricultural, greenhouse gas, recreational and urban greenspace impacts of the envisioned land use changes are valued. Particular attention is given to the incorporation of spatial variation in the natural environment and to addressing issues such as biodiversity impacts where reliable values are not available. Results show that the incorporation of ecosystem services and their values within analyses can substantially change decisions. 相似文献
37.
This article contributes to the economic literature on pure and impure public goods by considering two alternatives for contributing to the public good climate protection: offsetting carbon emissions from conventional consumption or paying higher prices for climate-friendly products. We empirically examine a wide range of motives and their impact on individuals’ choice in favour of these two alternatives relying on data from representative international surveys. Our results indicate that environmental awareness, warm glow motives and the desire to set a good example have the most robust effects on both climate protection activities in Germany and the United States. However, some motives differ considerably between both alternatives and the two countries. A green identity enhances the willingness to pay a price premium for climate-friendly goods or services in Germany, while social norms seem to be of much higher relevance in the United States. Our results further suggest that the choice of climate protection activities, especially of carbon offsetting, entails a high degree of uncertainty. 相似文献
38.
We study reputational herding in financial markets in a laboratory experiment. In the spirit of Dasgupta and Prat [2008], career concerns are introduced in a sequential asset market where wages for investors are set by subjects in the role of employers. Employers can observe investment behavior, but not investors' ability types. Thereby, reputational incentives may arise endogenously. We find that a sizable fraction of investors follows an established trend even in a setting where there are no reputational incentives. In a setting where there are reputational concerns, they do not seem to create substantial herd behavior. 相似文献
39.
Maneka Jayasinghe Shyama Ratnasiri Christine Smith Andreas Chai 《Applied economics》2018,50(16):1777-1789
While it is well known that new technologies enhance consumer welfare, the manner in which these technologies impact the ability to realize economies of scale in consumption is not well understood. We use Sri Lankan household data to examine how the adoption of new technologies by households positively impacts their ability to achieve household economies of scale. This suggests that new technologies not only deliver a greater variety of consumption goods to consumers, but they may also play an important role in enabling large households to escape poverty by lowering the per-capita costs of maintaining a given standard of living. Given the importance of consumption economies of scale in the measurement of poverty, this study provides some insights on the extent to which the number of poor households changes when food consumption scale economies due to technology adoption in the domestic sphere are incorporated. 相似文献
40.
现有的BIM应用软件提供的乔木模型多为RPC或高
精度3D模型等3D CAD类型。这些模型着重于表达美感或进
行展示,无法反映根系情况。虽然可能包含一定附加属性,但
表达乔木生长和空间需求的功能有限。因而,冲突检查、工序
调度等BIM的优势功能无从应用。风景园林实践领域已就此问
题开始构建自己的模型库,但能够准确反映现状树木真实尺寸
体量,以及现状树木和规划树木未来空间需求的模型仍未广泛
出现。提出一种基于树冠、树干和根系构型与生长功能的实体/
网面封装建模方法构建BIM乔木模型。模型形态通过一组参数
调整,并根据树龄和反映环境限制因子的值来反映其变化。所
包含的数据和参数数量随后期设计阶段所需的LoD(详细层级)
及专业实践的具体要求而增加。该模型可以与提供本地区内外
苗木商品信息的植物数据库连接使用。 相似文献