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   2579篇
  免费   103篇
财政金融   521篇
工业经济   246篇
计划管理   416篇
经济学   578篇
综合类   48篇
运输经济   18篇
旅游经济   72篇
贸易经济   453篇
农业经济   79篇
经济概况   251篇
  2023年   14篇
  2021年   32篇
  2020年   50篇
  2019年   81篇
  2018年   75篇
  2017年   79篇
  2016年   62篇
  2015年   39篇
  2014年   59篇
  2013年   252篇
  2012年   91篇
  2011年   88篇
  2010年   84篇
  2009年   84篇
  2008年   82篇
  2007年   69篇
  2006年   82篇
  2005年   80篇
  2004年   59篇
  2003年   71篇
  2002年   64篇
  2001年   48篇
  2000年   40篇
  1999年   51篇
  1998年   43篇
  1997年   42篇
  1996年   49篇
  1995年   30篇
  1994年   30篇
  1993年   33篇
  1992年   39篇
  1991年   28篇
  1990年   28篇
  1989年   28篇
  1988年   36篇
  1987年   23篇
  1986年   29篇
  1985年   60篇
  1984年   40篇
  1983年   43篇
  1982年   47篇
  1981年   31篇
  1980年   41篇
  1979年   35篇
  1978年   26篇
  1977年   29篇
  1976年   22篇
  1975年   24篇
  1974年   19篇
  1973年   13篇
排序方式: 共有2682条查询结果,搜索用时 15 毫秒
101.
Raising the minimum wage has been advanced as complementary policy to comprehensive immigration reform to improve low‐skilled immigrants’ economic well‐being. While adverse labor demand effects could undermine this goal, existing studies do not detect evidence of negative employment effects. We re‐investigate this question using data from the 1994 to 2016 Current Population Survey and conclude that minimum wage increases reduced employment of less‐educated Hispanic immigrants, with estimated elasticities of around –0.1. However, we also find that the wage and employment effects of minimum wages on low‐skilled immigrants diminished over the last decade. This finding is consistent with more restrictive state immigration policies and the Great Recession inducing outmigration of low‐skilled immigrants, as well as immigrants moving into the informal sector. Finally, our results show that raising the minimum wage is an ineffective policy tool for reducing poverty among immigrants.  相似文献   
102.
This article examines real estate's role in institutional mixed‐asset portfolios using both private‐ and public‐real estate indices, as a means of examining varying real estate‐related risk/return opportunities. In so doing, this article also examines the effects of: (1) increasing the investment horizon, (2) placing constraints on the maximum allocation to any one asset class, and (3) varying the risk preferences of investors. The empirical results suggest—using infinite‐horizon returns and all of the caveats that accompany such a perspective—that real estate allocations of approximately 10–15% of the mixed‐asset portfolio represent an upper bound for most investors. For those investors preferring low‐risk portfolios, (unlevered) private real estate is the vehicle serving this allocation preference; for those investors preferring high‐risk portfolios, public real estate (with its embedded leverage of 40–50%) is the vehicle serving this allocation preference—with such vehicles serving as substitutes for a variety of noncore real estate strategies. In some sense, the distinction between private and public real estate is more about the use of leverage. For those investors preferring moderate‐risk portfolios, an intermediate‐leverage approach seems optimal.  相似文献   
103.
Ecological integrity is important to fully describe the development of an economy. We calculated an aggregate index that quantifies the closeness of a forested region to a natural state. This naturalness index was based on the diversity of native tree species and sizes for ecological subregions in a seral condition. The index used the spatial–temporal array of sample plots from the Forest Inventory and Analysis (FIA) database of the USDA Forest Service. In the 70 survey units of the southern US between 1961 and 2005 the naturalness of forests generally improved with per capita personal income and population. The increase with income was consistent with the hypothesis of an environmental Kuznets curve for forested landscapes.  相似文献   
104.
During many manmade and natural crises such as terrorist threats, floods, hazardous chemical and gas leaks, emergency personnel need to estimate the time in which people can evacuate from the affected urban area. Knowing an estimated evacuation time for a given crisis, emergency personnel can plan and prepare accordingly with the understanding that the actual evacuation time will take longer. Given the urban area to be evacuated, street widths exiting the area's perimeter, the area's population density, average vehicle occupancy, transport mode share and crawl speed, an estimation of traffic evacuation time can be derived. Peak-hour traffic data collected at three, midblock, Mumbai sites of varying geometric features and traffic composition were used in calibrating a model that estimates peak-hour traffic flow rates. Model validation revealed a correlation coefficient of +0.98 between observed and predicted peak-hour flow rates. A methodology is developed that estimates traffic evacuation time using the model.  相似文献   
105.
106.
107.
Abstract: This article provides empirical evidence on technical efficiency differences and efficiency distribution for three Kenyan manufacturing subsectors, namely food, metal and textile, using an unbalanced panel data covering two periods. Econometric production frontiers are estimated for each subsector in each period. The confidence predictions for these efficiencies were, however, found to be quite wide. The results indicate variation of technical efficiency estimates of the sampled firms in each period. The technical efficiency distribution for each subsector changed not only in relation to itself, but also in relation to the other subsectors across the two periods of analysis. The efficiency distribution of the firms for both food and textile (metal) subsectors improved (declined) during the study period but with the food subsector firms remaining relatively inefficient. The improvement of the technical efficiency distribution for both the textile and food subsectors is an indication of intra‐plant improvement during the period of analysis. The decline of the technical efficiency distribution for the metal subsector suggests that the market orientation during the structural reform period did not promote firm efficiencies or the firms were slow in responding to the reforms.  相似文献   
108.
Projective customer competence is the ability of a product development organization to both understand as well as shape the future needs of customers. To conceptualize this competence and establish its antecedents and performance implications, we draw upon the literature on inter-organizational relationships and innovation. Based on survey data from managers involved with business to business product development, validated with secondary financial data and in-depth interviews, we establish measurement properties for projective customer competence and demonstrate that this competence develops through customer relationships characterized by relational embeddedness, knowledge redundancy and interactivity. Projective customer competence is also shown to have positive implications for both innovativeness and financial performance. Surprisingly, relational embeddedness is shown to be the strongest predictor of projective customer competence, and, while knowledge redundancy helps build projective customer competence, it also has a negative impact on innovativeness.  相似文献   
109.
110.
The foundational international business (IB) scholarship grappled with whether multinational enterprises (MNEs) are largely efficiency‐enhancing or market‐power inducing institutions. Contemporary scholarship, however, often associates foreign direct investment (FDI) with efficiency‐enhancing properties and thus neglects the market‐power interpretation of the MNE. Such an imbalance is problematic given that the theoretical and empirical justifications behind the field's embrace of the efficiency interpretation are not fully evident. Instead, both efficiency and market‐power effects are seemingly present in cross‐border investment activity. Based on a comprehensive sample of up to 4,361 cross‐border investments materializing between 1986 and 2010, we present theoretically‐grounded hypotheses with regard to when market‐power effects will tend to dominate efficiency effects. We find that cross‐border investments undertaken by emerging‐market MNEs in both developed and emerging markets tend to involve substantial efficiency effects and minimal market‐power effects when compared with the cross‐border investments undertaken by developed‐country MNEs in both developed and emerging markets.  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