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   140241篇
  免费   3915篇
  国内免费   1篇
财政金融   26420篇
工业经济   11756篇
计划管理   22574篇
经济学   30496篇
综合类   1505篇
运输经济   981篇
旅游经济   2518篇
贸易经济   24116篇
农业经济   6224篇
经济概况   17265篇
信息产业经济   7篇
邮电经济   295篇
  2021年   859篇
  2020年   1657篇
  2019年   2435篇
  2018年   2457篇
  2017年   2597篇
  2016年   2783篇
  2015年   2134篇
  2014年   3465篇
  2013年   15565篇
  2012年   4299篇
  2011年   4337篇
  2010年   3828篇
  2009年   4448篇
  2008年   4053篇
  2007年   3418篇
  2006年   3683篇
  2005年   3682篇
  2004年   3265篇
  2003年   3044篇
  2002年   2987篇
  2001年   2771篇
  2000年   2686篇
  1999年   2538篇
  1998年   2422篇
  1997年   2426篇
  1996年   2293篇
  1995年   2092篇
  1994年   2121篇
  1993年   2087篇
  1992年   2130篇
  1991年   2037篇
  1990年   1898篇
  1989年   1724篇
  1988年   1661篇
  1987年   1668篇
  1986年   1752篇
  1985年   2533篇
  1984年   2413篇
  1983年   2215篇
  1982年   2079篇
  1981年   1982篇
  1980年   1956篇
  1979年   1884篇
  1978年   1682篇
  1977年   1645篇
  1976年   1400篇
  1975年   1298篇
  1974年   1195篇
  1973年   1191篇
  1972年   904篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Differences in accrued gains and investors’ tax-sensitivity induce variation in a capital gains lock-in effect across mutual funds even for the same stock at the same time. Exploiting this variation, we show this effect influences funds’ governance decisions: higher capital gains decrease the likelihood a fund exits prior to contentious votes and increase the likelihood a fund votes against management. Consistent with tax motivation, these findings are concentrated among funds with tax-sensitive investors. Further, high aggregate capital gains across funds holding a stock predict a higher likelihood management loses a vote and a lower likelihood a contentious vote is proposed.  相似文献   
12.
Growing urbanisation in South Africa is reflected in burgeoning Working class and informal township settlements on the fringes of its major towns and cities. Paired with this is an increasing reliance on cash as the primary means of economic transaction, which has in turn stimulated the growth of micro-enterprise business activities within the township context. This article discusses the findings of an eight-township small-area census which occurred between 2010 and 2013 in Cape Town, Johannesburg, Ekurhuleni and Durban townships representing 250 000 residents. The researchers were able to establish the scope and scale of informal food and drink retailing in these localities. Of the 10 049 micro-enterprises located in the study, some 3966 (or 39% of the total) trade in food. These include enterprises in primary production, fresh produce retailing, grocery retailing from house and spaza shops, and informal foodservice enterprises. Food is the basis for much township informal business and plays an important role in making food increasingly affordable and locally accessible, and in creating cash employment. The article builds on the knowledge base of the township informal economy role in bolstering food security needs for the marginalised.  相似文献   
13.
Without guaranteed compensation, granted by the German Renewable Energy Sources Act (Erneuerbare Energien Gesetz/EEG), biogas plants compete with all other plant types on the market for electrical energy. However, exchange-based electricity products do not currently permit an economically viable operation of biogas plants owing to their cost situation.  相似文献   
14.
Desde hace tiempo se viene documentando en múltiples estudios la vulneración de los derechos de los trabajadores en las cadenas mundiales de suministro de la industria de la confección; sin embargo, se ha prestado menos atención al reciente empeoramiento de algunos déficits de trabajo decente y sus causas, que el presente artículo asocia a las prácticas de compra predatorias derivadas de las crecientes asimetrías de poder. Estas prácticas, ilustradas aquí a través de las empresas indias del sector del vestido orientadas a la exportación, ejercen presiones salariales a la baja y favorecen la proliferación de formas atípicas de empleo y la banalización de la violencia física y verbal contra los trabajadores, al tiempo que aumentan las exigencias de productividad. Para frenar esta evolución, es necesario establecer mecanismos de fijación de precios que tengan en cuenta el costo que entraña el cumplimiento del principio del trabajo decente, adoptar una reglamentación estatal adecuada y contar con la participación de los trabajadores.  相似文献   
15.
16.
Objective: This study was to determine if calcium fortification yields a higher price per serving in grocery store products. Researchers compared store brand to national brand grocery products in relation to cost in order to examine if calcium values were similar between store brand and national brand products. Methods: A total of 112 store brand and 211 national brand grocery products were collected from three low (national chain store), middle and high priced (Virginia and North Carolina regional store) grocery venues. Products were compared using price and calcium percentage per serving. ANOVA was used to determine between store brand and national brand for price per serving and calcium content, and between grocery venues. Results: National brand fortified products had a significantly lower mean price per serving when compared to national brand non-fortified products (p = 0.0002). There was no statistical difference between store brand fortified and non-fortified products (p = 0.9256). Low priced store brand products had the lowest mean price per serving ($0.34 ±0.24). Conclusions: This study found store brand products have similar calcium content as national brand products. Product cost was lower at low priced store compared to middle and high priced stores.  相似文献   
17.
Consumer “multihoming” (watching two TV channels, or buying two news magazines) has surprisingly important effects on market equilibrium and performance in (two‐sided) media markets. We show this by introducing consumer multihoming and advertising finance into the classic circle model of product differentiation. When consumers multihome (attend more than one platform), media platforms can charge only incremental value prices to advertisers. Entry or merger leaves consumer prices unchanged under consumer multihoming, but leaves advertiser prices unchanged under single‐homing: Multihoming flips the side of the market on which platforms compete. In contrast to standard circle results, equilibrium product variety can be insufficient under multihoming.  相似文献   
18.
19.
We study the effect of the educational diversity of managers on the performance of team‐managed mutual funds using a large sample of U.S. equity funds from 1994 to 2013. We consider diversity in terms of both final educational degree and field of educational specialisation. We find that, in general, both types of diversity have a positive impact on fund performance, and our results are robust over a wide range of performance metrics and changes in market conditions.  相似文献   
20.
Abstract

Traditional warranty analysis focuses on the reliability of a product and offers warranty designs that compensate a consumer if the item fails. We introduce the concept of a performance-based warranty (PBW) that guarantees that a product will operate at or above some baseline level of performance, such as a minimum energy efficiency for an appliance. We illustrate how consumer behavior can change in the presence of a PBW and define the parameters for which a manufacturer may increase revenue. Finally, we present an algorithm to solve for the optimal PBW design given a consumer’s belief about the expected performance of the product.  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