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   483篇
  免费   12篇
财政金融   123篇
工业经济   16篇
计划管理   58篇
经济学   67篇
运输经济   8篇
旅游经济   36篇
贸易经济   71篇
农业经济   57篇
经济概况   59篇
  2023年   2篇
  2020年   7篇
  2019年   8篇
  2018年   11篇
  2017年   6篇
  2016年   8篇
  2015年   12篇
  2014年   12篇
  2013年   91篇
  2012年   13篇
  2011年   12篇
  2010年   14篇
  2009年   11篇
  2008年   12篇
  2007年   14篇
  2006年   8篇
  2005年   13篇
  2004年   13篇
  2003年   14篇
  2002年   12篇
  2001年   13篇
  2000年   10篇
  1999年   11篇
  1998年   11篇
  1997年   5篇
  1996年   11篇
  1995年   9篇
  1994年   6篇
  1993年   7篇
  1992年   4篇
  1991年   7篇
  1990年   7篇
  1989年   4篇
  1988年   6篇
  1986年   5篇
  1985年   7篇
  1984年   4篇
  1983年   8篇
  1982年   14篇
  1981年   10篇
  1980年   7篇
  1979年   3篇
  1978年   6篇
  1977年   2篇
  1976年   8篇
  1975年   2篇
  1974年   5篇
  1973年   3篇
  1971年   1篇
  1970年   3篇
排序方式: 共有495条查询结果,搜索用时 31 毫秒
491.
Factor analysis and cluster analysis are used to analyze the attitudes and perceptions of agricultural households toward farming, commercialization, and barriers to and drivers for increased integration in agricultural markets. Data come from farms in five EU New Member States. The contribution of unsold output to total household income is valued. Stepwise linear regression is employed to detect variables useful in explaining the degree of agricultural market integration of farm households. The analysis indicates that subsistence farming is of utmost importance for the rural poor, particularly in Bulgaria and Romania. The proportion of consumption from own production, manual cultivation techniques, and distance to an urban center are negatively correlated with output sales. Rural development policies targeted at rural physical and market infrastructure might relieve some of these constraints.  相似文献   
492.
In Canada, average grain freight rates are regulated via the Maximum Revenue Entitlement (MRE), while on the US side of the border grain rates are subject to very little oversight. We use this natural experiment to explore how the MRE regulation has impacted freight rates and the distribution of rents in the wheat supply chain since 2012. On both sides of the border, when large crops have exceeded the short‐term capacity of grain export channels to move the crop, export basis has increased and reduced producer prices. In locations not subject to barge competition, US grain freight rates are higher than Canadian rates and are bid up further during periods of congestion. In Canada, MRE regulation redistributes rents away from railways toward grain companies and producers. These higher grain handling margins have increased the incentives to build additional port terminal capacity in the post‐CWB single desk environment. Au Canada, les tarifs marchandises moyens des céréales sont règlementés par le Revenu admissible maximal (RAM), tandis qu'aux États‐Unis, les tarifs céréaliers font l'objet de très peu de suivi. Au moyen de cette expérience naturelle, nous explorons l'impact du RAM sur les tarifs marchandises et sur la distribution des rentes dans la chaine d'approvisionnement du blé depuis 2012. Des deux côtés de la frontière, lorsque de vastes cultures ont excédé la capacité à court terme des voies d'exportation céréalières pour distribuer leurs récoltes, le seuil d'exportation augmente et réduit les prix des producteurs. Là où ils ne sont pas assujettis à la compétition de barges, les tarifs marchandises céréaliers américains s'avèrent plus élevés que les tarifs canadiens et se voient encore surenchéris lors de période de congestion. Au Canada, la règlementation du RAM redirige les rentes des compagnies ferroviaires aux entreprises et producteurs céréaliers. Ces marges de manutention plus élevées ont augmenté les incitatifs pour accroître la capacité des ports‐terminaux dans un environnement à pupitre unique, post Commission canadienne du blé.  相似文献   
493.
This article argues that the politics of scale in a nested hierarchy of cotton governance institutions in Burkina Faso are weighted against smaller producers, with what looks like success from a broader scale producing uneven development at the local scale. We show that at the national level, Burkina Faso has succeeded in increasing its output of cotton lint. At the local level, we see a differentiated outcome where the liberalization‐initiated system of shared liability has improved overall cotton cooperative management but this has come at a significant cost: the exit of poorer farmers from the cotton sector and an increasing debt burden on those individual farmers who remain. The novelty of this article is that it considers producers' institutions as a key level of analysis linking macro‐scale policy decisions to micro‐scale village and farm outcomes. The resulting analysis allows us to focus on the politics of scale, particularly the power relations of different actors and the ability to capture resources at different levels, as well as the role of multilevel institutions in producing differentiated outcomes.  相似文献   
494.
The value of imputation credits can only be estimated jointly with the value of cash dividends. We show that random variation across samples leads to estimates of credit value that move in the opposite direction to estimates of cash value. Derivative prices suggest a value for credits of 0.01 to 0.20 (0.01 to 0.07 if cash is worth 0.94, and 0.13 to 0.20 if cash is worth 0.87). Ex-dividend prices suggest a value for credits of 0.23 to 0.46 (0.23 to 0.36 if cash is worth 0.85, and 0.33 to 0.46 if cash is worth 0.75).  相似文献   
495.
Health improved in English cities in the last third of the nineteenth century, in tandem with substantial increases in public spending on water supplies and sanitation. However, previous efforts to measure the contribution of public expenditures to mortality improvements have been hampered by difficulties in quantifying public health investments and the lack of mortality data for specifically urban populations. We improve upon the existing evidence base by (1) creating measures of the stock of urban district sanitary capital, by type, on the basis of capital expenditure flows, rather than loan stocks; (2) using mortality and capital stock data that relate to the same administrative units (urban districts), and (3) studying the period 1880–1909 as well as the earlier period from 1845. The stock of sewerage capital was robustly related to improvements in all-cause mortality after 1880. The size of this effect varied with the extent of public investment in water supplies, suggesting complementarity between the two assets. For the period 1845–84, investments in water were associated with declines in infant and child mortality but the effect was much smaller and less precisely estimated in later decades. Our results suggest that improvements in water and sewerage targeted different transmission pathways for faecal–oral diseases.  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