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   44258篇
  免费   483篇
  国内免费   3篇
财政金融   6222篇
工业经济   2788篇
计划管理   8446篇
经济学   8815篇
综合类   2727篇
运输经济   182篇
旅游经济   148篇
贸易经济   7491篇
农业经济   1656篇
经济概况   5586篇
信息产业经济   49篇
邮电经济   634篇
  2024年   56篇
  2023年   247篇
  2022年   467篇
  2021年   673篇
  2020年   652篇
  2019年   439篇
  2018年   2609篇
  2017年   2725篇
  2016年   1696篇
  2015年   709篇
  2014年   920篇
  2013年   1472篇
  2012年   2571篇
  2011年   5519篇
  2010年   4854篇
  2009年   3402篇
  2008年   3501篇
  2007年   3750篇
  2006年   2150篇
  2005年   2217篇
  2004年   995篇
  2003年   1034篇
  2002年   714篇
  2001年   501篇
  2000年   275篇
  1999年   116篇
  1998年   106篇
  1997年   77篇
  1996年   67篇
  1995年   28篇
  1994年   30篇
  1993年   30篇
  1992年   33篇
  1991年   27篇
  1990年   20篇
  1989年   11篇
  1988年   12篇
  1987年   5篇
  1986年   13篇
  1985年   1篇
  1984年   14篇
  1983年   2篇
  1980年   2篇
  1978年   1篇
  1900年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
This paper investigates the effect of nearby nature substitute sites on preferences for nature restoration. Contrary to prior studies, we use a respondent-centric approach to control for substitute sites. We assess each respondent-specific spatial context by computing densities of nature substitute sites within various ranges from each respondent’s home. This approach considers the use and non-use values of nature together. Data from three similar discrete choice experiments carried out in Flanders (Belgium) are compared. Different spatial discounting factors are tested to explore how the substitution effect behaves with regard to distance. Latent class analyses are performed to account for preference heterogeneity among respondents. We observe divergent behaviours across groups of respondents. The “distance-to-substitutes” affects how respondents gauge substitute sites. We find a significant influence of the squared average buffer distance but this effect varies in sign across case studies and classes of respondents. Our results demonstrate that individual-specific GIS data can significantly improve the representation of the spatial context and the transferability of value functions. However, the roles played by preference heterogeneity and nature perception on respondents’ capacity to value nature still deserves further attention in future research.  相似文献   
992.
This study examines whether there was a Malthusian equilibrium mechanism in Sweden in the pre-industrial period. A unique data set on harvests, deaths, marriages and births going back to 1630 is used to calculate cumulative elasticities of vital rates with respect to harvest. While earlier studies have mostly focused on the impact of real wage, this study uses the calorie content of per capita harvests as an indicator of living standards. It finds that there indeed was a response of vital rates to harvest fluctuations, but there were important structural breaks. While positive checks attenuated after 1720, preventive checks were strengthened. After 1870 preventive checks disappeared, and possibly also positive checks. The results are robust to different models and trend specifications, with one crucial difference: while the distributed lag model shows that positive checks were significant up to 1920, the SVAR model shows that positive checks disappeared after 1870.  相似文献   
993.
994.
This special issue focuses on entrepreneurship, innovation and enterprise dynamics, as these key components of any prospering economy are at the heart of the current policy discussion. It gathers the latest national and comparative cross-country evidence about: new business venture formation and the role of framework conditions in fostering entrepreneurial activities; the determinants and outcomes of firms’ innovative activities and, more generally, of business and innovation dynamics; and the determinants and patterns of post-entry firm growth performance. The contributions synthesised in this introductory piece all rely on sound micro-level data and robust econometrics and propose novel findings that are relevant for policy making. Among them, that risk aversion encourages individuals to invest in balanced skill profiles, making them more likely to become entrepreneurs; and that while micro firms may grow when they are young, they are less likely to do so when old.  相似文献   
995.
Available evidence shows that consumers overinsure against modest risks. For instance, a majority of consumers tend to choose too low a level of deductible for homeowners insurance and automobile insurance, and purchase excessive warranties for electronics and other durable products such as automobiles and furniture. The analysis demonstrates that overinsurance decreases consumer welfare and increases insurers’ profits. This tendency of overinsurance stems from lack of information about the probability and magnitude of loss, and it calls for policies that require insurers or third-party organizations to provide more, albeit not perfect, information and data for consumers before they make insurance-purchase decisions. The implications of the analysis for other financial products such as stocks and deposits are discussed.  相似文献   
996.
997.
This study examines the mediating role of group efficacy on the relationship between group affect and group identification by integrating the collective cognition process. Using a sample of forty-seven work groups in Study 1, the results show that group efficacy fully mediates the relationship between positive and negative group affect and group identification. Study 2 applies a two-wave panel design to verify the impact of group efficacy on group identification. The results of Study 2 indicate that group efficacy relates positively to the development of group identification. The implications for theory and practice are discussed.  相似文献   
998.
Business economists face increasing challenges at this political and policymaking juncture. “Experts” and economists are out of favor with the public and with certain policymakers. In response, business economists should be frank about our failures and the limits of our models. We can then be ready to defend truth against falsehood. In our defense of fact-based decision making, we must first assert that data matter, and the unbiased integrity of that data matters. We must support and defend the work of the Bureau of Economic Analysis, the Bureau of Labor Statistics, and the Census Bureau. Business economists must be story tellers, transmitting historical memory of past crises, of past attacks on our profession and data sources (such President Nixon’s targeting of the Bureau of Labor Statistics).  相似文献   
999.
1000.
This paper discusses the role of technological spillovers and technological races in dynamic strategic interactions setup. Two firms invest simultaneously into new products creation and into further development of the quality of these products. Each firm may benefit from the costless technological spillover in case of technological leadership of the other firm. At the same time they cooperate in the joint creation of new products. Three different scenarios emerge: constant technological leadership, the technological leapfrogging and symmetric outcome with or without potential spillovers. R&D is maximal for the first scenario and minimal for the symmetric play under the threat of spillover with endogenous specialization of firms’ activities in cases of constant leadership and leapfrogging. Definition of technological competition intensity as inverse to the technology gap allows to recover inverted-U relationship between those two in a multidimensional context.  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