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   22616篇
  免费   432篇
财政金融   4011篇
工业经济   1642篇
计划管理   3834篇
经济学   5066篇
综合类   228篇
运输经济   146篇
旅游经济   287篇
贸易经济   3377篇
农业经济   1158篇
经济概况   3201篇
信息产业经济   1篇
邮电经济   97篇
  2020年   217篇
  2019年   343篇
  2018年   459篇
  2017年   467篇
  2016年   462篇
  2015年   278篇
  2014年   489篇
  2013年   2044篇
  2012年   623篇
  2011年   655篇
  2010年   541篇
  2009年   695篇
  2008年   599篇
  2007年   541篇
  2006年   496篇
  2005年   471篇
  2004年   433篇
  2003年   465篇
  2002年   439篇
  2001年   421篇
  2000年   465篇
  1999年   429篇
  1998年   387篇
  1997年   385篇
  1996年   385篇
  1995年   330篇
  1994年   349篇
  1993年   369篇
  1992年   395篇
  1991年   379篇
  1990年   387篇
  1989年   335篇
  1988年   289篇
  1987年   298篇
  1986年   323篇
  1985年   432篇
  1984年   394篇
  1983年   359篇
  1982年   352篇
  1981年   360篇
  1980年   332篇
  1979年   355篇
  1978年   293篇
  1977年   279篇
  1976年   265篇
  1975年   228篇
  1974年   202篇
  1973年   205篇
  1972年   172篇
  1971年   134篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Following a general-to-specific strategy of model development, we develop error-correction equations for fed beef supply and feeder cattle demand. Starting with a theoretically acceptable set of variables, preliminary tests for unit roots and cointegrating vectors show stationary quantity variables and cointegrated prices. Simplification of the lag structure leads to equations with considerably richer dynamics than in previous studies. The final model passes several misspecification tests, is robust when estimated on subsamples of data, and makes more accurate out-of-sample forecasts than other models. In beef supply, the estimated error-correction model decomposes the backward-bending supply hypothesis into negative short-run and positive long-run supply elasticities at the monthly frequency.  相似文献   
992.
Exploratory case study research was initiated to study the evolution of management information systems and their use in operational and strategic decisions. The unit of analysis was the management team on farms with innovative or successful information systems. Human factors, such as an analytical nature and commitment to lifelong learning, were perceived to be the most important common elements. Production variables often were critical success factors. Managers annually developed financial statements; enterprise and "what if" analyses were conducted regularly. Learning about questions that innovative producers have difficulty addressing was time-consuming but instructive with respect to research and educational needs.  相似文献   
993.
A total of 289 studies of returns to agricultural R&D were compiled and these provide 1821 estimates of rates of return. After removing statistical outliers and incomplete observations, across the remaining 1128 observations the estimated annual rates of return averaged 65 per cent overall — 80 per cent for research only, 80 per cent for extension only, and 47 per cent for research and extension combined. These averages reveal little meaningful information from a large body of literature, which provides rate-of-return estimates that are often not directly comparable. This study was aimed at trying to account for the differences. Several features of the methods used by research evaluators matter, in particular assumptions about lag lengths and the nature of the research-induced supply shift.  相似文献   
994.
This paper investigates why labor demand has shifted away from low-skilled toward high-skilled labor in The Netherlands. We focus on the role of changes in relative wages and technological progress. A flexible functional form, proposed by Diewert and Wales, the Symmetric Generalized McFadden cost function, is estimated for the exposed and sheltered sectors. The estimates are based on time-series data for the period 1972–1993, which recently became available. Labor-saving technological change explains most of the displacement of low-skilled workers. The computed elasticities suggest that substitution between labor as a whole and capital is small. However, substitution plays a modest role in the shift from low-skilled toward high-skilled labor, especially in the sheltered sector. Skill-capital complementarity seems relevant in both sectors.  相似文献   
995.
The distributional effects of a major air regulation in the United State in 2015 were analyzed using Berliant and Strauss Index Numbers, a set of theoretical and empirical equity metrics, and reduced‐form models that estimate the mortality effects of air pollutant emissions and their source contributions. By viewing the effects of pollution on human mortality as an implicit tax, we found progressivity in 54% to 56% of vertical comparisons and inequity in 92% to 94% of horizontal comparisons. The introduction of the proposed policy made 58% of vertical comparisons more progressive and was equitable to 70% of horizontal comparisons.  相似文献   
996.
The interrelationships among a number of variables and their effect on ethical decision making was explored. Teams of students and managers participated in a competitive management simulation. Based on prior research, the effects of performance, environmental change, team age, and type of team on the level of ethical behavior were hypothesized. The findings indicate that multiple variables may interact in such a fashion that significance is lost.  相似文献   
997.
The plurality of languages and ethnicities, the geographic fragmentation, the predominant Roman Catholic religion, together with the still relatively short experience in nationhood account for a very peculiar understanding of "business ethics" in the Philippines. The rapid growth and liberalization of the economy, coupled with the inequitable distribution of wealth, the destruction of the environment and corruption are the main ethical concerns. Businesspersons and the academe endeavor to find creative solutions for these unique challenges.  相似文献   
998.
999.
This paper examines the evolution of regional disparities within the present-day borders of Turkey since 1913. Based on our estimates for 58 provinces, we find β-convergence, an inverse U, and more recently, the beginnings of an N-shaped pattern for value added per capita. We also find that regional disparities in Turkey exhibit a number of special features that do not easily fit the well-studied pattern of the early industrializers. First, while per capita value added in other regions moved towards country averages, the differences between the East and the rest of the country persisted and even increased until recently. Second, spatial distribution of economic activity became more concentrated over time due to continued migration to the megacity of Istanbul. Third, we find that regional disparities in per capita value added in Turkey and other developing countries have been higher than those experienced by the early industrializers. These findings raise questions about the extent to which the regional disparities experiences of Turkey and other developing countries have been different than those of the early industrializers.  相似文献   
1000.
Decline and variability in brand loyalty   总被引:3,自引:0,他引:3  
In this paper, we examine the over-time behavior of brand loyalty for a large set of brands drawn from 21 consumer packaged goods categories. Using the brand-loyalty operationalization of Colombo and Morrison (1989), the following conclusions are obtained. First, little support is found for the often-heard contention that brand loyalty is gradually declining over time. Second, while the short-run variability around a brand's mean loyalty level is not negligible, no evidence is found that this variability has systematically increased over time, and it can be reduced considerably through a simple smoothing procedure. Finally, the brand-loyalty pattern for market-share leaders is found to be more stable than for other brands. The study findings were robust to variation in the time interval used to construct the switching matrices, and to different treatments of multiple purchases.  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