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   16477篇
  免费   388篇
  国内免费   2篇
财政金融   3109篇
工业经济   1086篇
计划管理   2710篇
经济学   3453篇
综合类   533篇
运输经济   95篇
旅游经济   226篇
贸易经济   2917篇
农业经济   697篇
经济概况   1890篇
邮电经济   151篇
  2021年   98篇
  2020年   185篇
  2019年   250篇
  2018年   373篇
  2017年   402篇
  2016年   390篇
  2015年   285篇
  2014年   386篇
  2013年   1697篇
  2012年   518篇
  2011年   544篇
  2010年   492篇
  2009年   452篇
  2008年   519篇
  2007年   406篇
  2006年   344篇
  2005年   351篇
  2004年   302篇
  2003年   317篇
  2002年   333篇
  2001年   336篇
  2000年   354篇
  1999年   263篇
  1998年   284篇
  1997年   284篇
  1996年   258篇
  1995年   253篇
  1994年   249篇
  1993年   308篇
  1992年   276篇
  1991年   246篇
  1990年   241篇
  1989年   199篇
  1988年   193篇
  1987年   191篇
  1986年   201篇
  1985年   272篇
  1984年   325篇
  1983年   273篇
  1982年   266篇
  1981年   281篇
  1980年   248篇
  1979年   250篇
  1978年   215篇
  1977年   200篇
  1976年   189篇
  1975年   155篇
  1974年   153篇
  1973年   141篇
  1972年   99篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
A test for the arbitrage pricing theory which employs a multivariate linear regression model is developed. Given a sample of return premiums for a set of N assets which includes a subset of k linearly independent portfolios, the k factor APT hypothesis is accepted if the intercept term is zero in the multivariate regression of the ( N ? k ) returns on the k portfolios. The test may be carried out simply, by using univariate multiple regression software. The relation of this test to the concept of performance potential and Sharpe's measure of performance is also discussed. If the performance potential of the k portfolios is not significantly less than the performance potential of the complete set of N assets, then the k factor APT hypothesis is accepted.  相似文献   
992.
993.
994.
995.
The intent in this study is to determine, using response surface methodology, whether call option prices can be relied upon to predict future rises in common stock prices. If call option prices are bid up by insiders prior to the time that new information becomes available to stock traders, recognition of this price action could form the basis of a stock trading strategy yielding returns superior to buy and hold. Evidence of such an advantage would be inconsistent with the efficient market hypothesis.  相似文献   
996.
The practical significance of the conventional “net farm income” is elusive. It would be useful to have an accepted method of dividing “management and investment income” into its recognised Components—managerial salary and return on tenant's capital. One is a residual if the other can be calculated, and both alternatives are considered. An empirical formula is suggested for estimating the managerial salary which may be imputed to the farmer, taking account of his total turnover, his labour bill and his net farm income. This formula is then applied to Farm Management Survey data, for individual farms and for groups of average, high and low performance (output per £ input). The method may permit closer analysis of relative profitability.  相似文献   
997.
A bstract . The relative advantages of private charitable organizations as against government agencies in achieving efficient redistribution of income and supply of services are examined. Central to this discussion is the elasticity of private giving to tax concessions and the propoition of donor dollars being absorbed in overhead. Recent estimates of these magnitudes are summarized. Of parallel concern is to what extent can reliance on altruism by sellers of goods and services serve as a substitute for government regulations to enforce standards, prices or product disclosures. Finally, the ways in which government can use and encourage private charitable impulse to maximize social welfare are examined; of particular interest here is the literature surrounding Richard Titmuss' work on blood donorsbip which raises the issue of whether or not extension of markets reduces, rather than extends, individual choice. The growing technological complexities of society, it is concluded, render the altruistic virtues of trust and consideration increasingly valuable—if increasingly rare.  相似文献   
998.
The paper presents an approach to an integrated long-run and short-run farm planning under uncertainty, based on a decomposition of the problem into (i) a series of short-run plans, and (ii) a master long-run plan. The series of the short-run plans are parametrically solved by linear programming "variable right hand" techniques and are later integrated into a long-run program using a (computerized) decision tree analysis. The attitude towards risk of the farm operator is expressed in the willingness to maximize the expected value of the income stream over the planning horizon subject to the restriction that alternatives which may lead to lack of liquidity must be eliminated.
Ce travail présenle une approche tentative ďintégrer, sous conditions incertaines, une planification de ferme à court et long terme. La planification est basée sur la partition du problème en (i) série de courte durée et (ii) de tongue durée. Les séries de courte durée sont résolues àľaide dun programme linéaire, et intégreés ensuite dans un programme à long terme àľaide de ľanalyse de "décision arbre."ľattitude envers les risques de ľentrepreneur est exprimée par la volonté-de maxiliser la valeur de revenu prévu au delá de la planification sous resérve de la restriction que des alternatives qui peuvent conduire à un manque de moyens liquides, doivent être éliminees.  相似文献   
999.
1000.
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