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   5702篇
  免费   92篇
  国内免费   1篇
财政金融   1247篇
工业经济   490篇
计划管理   967篇
经济学   1060篇
综合类   81篇
运输经济   49篇
旅游经济   85篇
贸易经济   999篇
农业经济   313篇
经济概况   502篇
邮电经济   2篇
  2021年   31篇
  2020年   74篇
  2019年   93篇
  2018年   101篇
  2017年   101篇
  2016年   115篇
  2015年   66篇
  2014年   111篇
  2013年   664篇
  2012年   168篇
  2011年   178篇
  2010年   160篇
  2009年   177篇
  2008年   184篇
  2007年   161篇
  2006年   170篇
  2005年   140篇
  2004年   142篇
  2003年   149篇
  2002年   171篇
  2001年   135篇
  2000年   118篇
  1999年   138篇
  1998年   113篇
  1997年   108篇
  1996年   102篇
  1995年   102篇
  1994年   84篇
  1993年   89篇
  1992年   83篇
  1991年   72篇
  1990年   69篇
  1989年   69篇
  1988年   68篇
  1987年   65篇
  1986年   77篇
  1985年   101篇
  1984年   93篇
  1983年   90篇
  1982年   75篇
  1981年   79篇
  1980年   80篇
  1979年   62篇
  1978年   72篇
  1977年   85篇
  1976年   46篇
  1975年   49篇
  1974年   55篇
  1973年   38篇
  1972年   32篇
排序方式: 共有5795条查询结果,搜索用时 15 毫秒
81.
82.
83.
Industry leaders frequently worry that their companies will fall victim to some revolutionary business model or disruptive technology. But new research shows that it's strategically better for incumbents to counter a revolution than to ignore or fully embrace it. Successful incumbents rely on one or more of five approaches to restrain, modify, or, if necessary, neutralize a revolutionary threat. A company that perceives a revolution in its earliest stages can use containment strategies. By throwing up roadblocks--raising switching costs, perhaps, or launching discrediting PR efforts--an incumbent can often limit the degree to which customers and competitors accept a nascent insurgency. And, sometimes, revolutions die there. If not, early containment buys a company some time to shape the revolution so that it complements, rather than supersedes, the incumbent's strengths. And even if shaping efforts fail, they can give an industry leader more time to work out how to absorb the threat by bringing the new competencies or technologies inside the firm in such a way that they don't destroy its existing strengths and capabilities. When revolutions have progressed too far to slow them down, incumbents must take a more aggressive tack. Neutralizing strategies meet a revolution head-on and terminate it--by, say, temporarily giving away the benefits offered by the challenger for free. Annulment strategies allow the market leader to leapfrog over or sidestep the threat. These five strategic approaches need not be used in isolation, as a detailed case study of the way Anheuser-Busch countered the craft-beer revolution dramatically demonstrates. Sensible industry leaders do not lead revolutions; they know they may not survive the attempt. Instead, they prefer to lead counterrevolutions.  相似文献   
84.
Urban Sprawl and Farmland Prices   总被引:1,自引:0,他引:1  
A theoretical model of farmland valuation is developed to explicitly account for three effects of urban sprawl: conversion of farmland to urban uses, effect on agricultural returns, and speculative effect as represented by farmland conversion risk. This model is estimated using county-level data in the continental United States. Evidence is found for all three effects of urban sprawl on farmland values. Counties more accessible to major urban centers have higher net agricultural returns. Subsidiary evidence supports that the latter effect may be attributed to survival of (or conversion to) high-valued agriculture around urban centers.  相似文献   
85.
86.
87.
88.
The paper examines the economic impact of pricing and access to public basic research‐related intellectual property (IP) in the presence of downstream interfirm spillovers using a Salop circle model of monopolistic competition. Depending on the nature and extent of spillovers and with free access to upstream basic research, firm entry can be excessive, insufficient, or socially optimal. When interfirm lump‐sum spillovers are absent or sufficiently small, competitive entry is excessive, so policies that restrict access to basic research IP can enhance social welfare. When lump‐sum research spillovers are sufficiently large, policies to induce entry and a clustering of downstream research activity can be welfare enhancing. Le présent article examine, à l’aide du modèle de Salop de concurrence monopolistique positionnant les firmes sur un cercle, l’impact économique de l’attribution d’une valeur à la propriété intellectuelle de la recherche fondamentale financée par des fonds publics et de l’accès à cette recherche lorsqu’il y a des retombées entre firmes en aval. Selon la nature et l’étendue des retombées et compte tenu de l’accès gratuit à la recherche fondamentale en amont, l’entrée de firmes peut‐être excessive, insuffisante ou optimale sur le plan social. Lorsque les débordements de la recherche vers d’autres firmes sont absents ou faibles, le niveau d’entrée de concurrence parfaite est excessif. Dans ce cas, les politiques qui restreignent l’accès à la recherche fondamentale financée par des fonds publics peuvent accroître le bien‐être social. Lorsque les débordements de la recherche sont assez importants, les politiques mises en ?uvre pour encourager l’entrée et le regroupement des activités de recherche en amont peuvent améliorer le bien‐être.  相似文献   
89.
A notable feature of many recent trade agreements is the gradual, rather than immediate, reduction of trade barriers. In this paper we model trade liberalization as a cooperative relationship that evolves gradually in a non-cooperative environment. We show that specialization, capacity irreversibility and the development of trade-partner specific capital increase the benefit of continuing the liberalizing relationship and decrease, over time, the lowest obtainable self-enforcing tariff. By increasing the penalty of future defection, sunk costs ensure that the self-enforcing trading relationship starts slowly, but once in progress the level of cooperation continues to improve.  相似文献   
90.
ABSTRACT

We undertook a review and classification of research on electronic commerce (e-commerce) in developing countries. We analyzed 181 articles published in a broad range of journals covering e-commerce, global information technology, and development issues. The analysis provides a roadmap that not only indicates the current state of e-commerce for development research but also identifies gaps and priorities for future research. This will be of significant value to both academics and practitioners who are working on, or plan to work on, e-commerce in developing countries.  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