全文获取类型
收费全文 | 8975篇 |
免费 | 448篇 |
国内免费 | 170篇 |
专业分类
财政金融 | 560篇 |
工业经济 | 489篇 |
计划管理 | 2368篇 |
经济学 | 1434篇 |
综合类 | 1197篇 |
运输经济 | 111篇 |
旅游经济 | 316篇 |
贸易经济 | 1388篇 |
农业经济 | 755篇 |
经济概况 | 975篇 |
出版年
2024年 | 25篇 |
2023年 | 140篇 |
2022年 | 152篇 |
2021年 | 234篇 |
2020年 | 263篇 |
2019年 | 209篇 |
2018年 | 228篇 |
2017年 | 267篇 |
2016年 | 288篇 |
2015年 | 367篇 |
2014年 | 766篇 |
2013年 | 936篇 |
2012年 | 749篇 |
2011年 | 888篇 |
2010年 | 706篇 |
2009年 | 528篇 |
2008年 | 585篇 |
2007年 | 519篇 |
2006年 | 420篇 |
2005年 | 349篇 |
2004年 | 236篇 |
2003年 | 184篇 |
2002年 | 139篇 |
2001年 | 96篇 |
2000年 | 97篇 |
1999年 | 47篇 |
1998年 | 34篇 |
1997年 | 33篇 |
1996年 | 28篇 |
1995年 | 21篇 |
1994年 | 11篇 |
1993年 | 7篇 |
1992年 | 6篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 6篇 |
1984年 | 7篇 |
1983年 | 9篇 |
1982年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有9593条查询结果,搜索用时 15 毫秒
31.
This study shows that firms in the pharmaceutical industry experience decreasing returns to scale in R & D as the level of R & D expenditures rises. The paper presents the results of our study of the innovative output of 16 pharmaceutical firms over a 19 year period. Given the strong correlation between R & D budgets and firm size, our study suggests the wave of mergers in the industry may yield less innovative productivity than managers expect. 相似文献
32.
针对供应商与制造商在产品开发合作中潜在的风险,建立了动态合作博弈模型,通过对正负激励策略的比较分析,得出两种激励策略按照一定结构混合运用能有效地发挥负激励降低合作风险、正激励增加合作收益的作用的结论。 相似文献
33.
Jayson L. Lusk W. Bruce Traill Lisa O. House Carlotta Valli Sara R. Jaeger Melissa Moore Bert Morrow 《Journal of Agricultural Economics》2006,57(1):1-21
The United States (US) exports more than US$6 billion in agricultural commodities to the European Union(EU) each year, but one issue carries the potential to diminish this trade: use of biotechnology in food production. The EU has adopted more stringent policies towards biotechnology than the US. Understanding differences in European and American policies towards genetically modified (GM) foods requires a greater understanding of consumers’ attitudes and preferences. This paper reports results from the first large‐scale, cross‐Atlantic study to analyse consumer demand for genetically modified food in a non‐hypothetical market environment. We strongly reject the frequent if convenient assumption in trade theory that consumer preferences are identical across countries: the median level of compensation demanded by English and French consumers to consume a GM food is found to be more than twice that in any of the US locations. Results have important implications for trade theory, which typically focuses on differences in specialization, comparative advantage and factor endowments across countries, and for on‐going trade disputes at the World Trade Organization. 相似文献
34.
综合配套改革各试验区研究热点述评 总被引:1,自引:0,他引:1
随着国家综合配套改革试验区的设立及其实践的不断深入,理论界就此开展了宏观和微观两个层面的研究。本文以现有的微观研究即分区研究为基础,分析各试验区理论研究的热点,阐述了分区研究的特点、所取得成果的意义及仍需深化的问题。 相似文献
35.
36.
农业的可持续发展已经成为当今世界农业发展的一种新战略,无论是发达国家,还是发展中国家都在积极研究符合自己国情的农业可持续发展模式。文章从河南省农业可持续发展的紧迫性与必要性研究出发,探讨了河南省农业可持续发展的战略指导思想及其战略目标,并提出了河南省农业可持续发展的对策与措施,以期为区域农业可持续发展研究提供参考。 相似文献
37.
Evaluation of the performance of GDSSs has been dominated by an experimental and laboratory based approach. Other writers
have argued for evaluation to be based in the “real-world” of decision making teams. The evaluation criteria have tended to
ignore many of the issues that would be paramount for some of the stakeholders in the evaluation process. This article seeks
to explore the criteria that might be used by a wide variety of stakeholders, including developers, facilitators, clients,
key actors, vendors, as well as academics. By drawing together the criteria associated with all of the stakeholders we discover
a broader, and possibly more thorough, framework for evaluation. The evaluation of any particular GDSS in relation to other
GDSSs can then be seen in the context of contingent weighting applied to each of the criteria where each GDSS is able to be
seen in its best light and in relation to its declared aims.
This article argues for a more eclectic and contingent approach to the evaluation of GDSSs which will encourage their future
development to be clearer about purpose and the boundaries of their use. 相似文献
38.
Can economically efficient outcomes be obtained and sustained in the absence of externally enforced property rights? We study the evolutionary properties of a game that exhibits two well-defined Nash equilibria: one generates an inefficient outcome while the other set generates an efficient outcome supported by the potential for retaliation. Although standard forward-looking refinements eliminate the efficient equilibrium, neither equilibrium type satisfies strict evolutionary stability criteria. However, both types of equilibrium define strategies that are neutrally stable, which makes them vulnerable to drift in dynamic environments. We conduct computer simulation experiments in which players learn adaptively via a tournament selection mechanism called sophisticated experimentation. Our simulations demonstrate that while the system spends a disproportionately high proportion of time in the inefficient equilibrium set, the efficient equilibrium is pervasive as the system drifts back and forth between the equilibrium sets, never settling on one or the other. 相似文献
39.
Stanley R. Johnson Tigran A. Melkonyan 《American journal of agricultural economics》2003,85(1):216-233
We develop a model explaining the consolidation patterns in the agricultural biotechnology industry. Among different consolidation and cooperation mechanisms, we consider collaborative and licensing agreements, joint ventures, acquisitions, and exchanges of ownership and spin-offs. The key results derive from the benefits of coordinated actions, distinction between transferable and nontransferable payoffs, the substitutability, complementarity, and the importance of the managers' noncontractible investments, and access and expansion of markets. Results from the model are used to examine the cooperation and consolidation activities for four major players in the agricultural biotechnology industry, DuPont , Dow Chemical , Monsanto , and Novartis . 相似文献
40.
战后日本对外贸易发展的动态比较优势分析 总被引:1,自引:0,他引:1
二战后日本经济从一片废墟中迅速崛起成功跻身于发达国家行列,其对外贸易在战后的50多年间一直保持着稳定的增长。日本出口商品结构沿着劳动密集型、资本密集型、知识和技术密集型的轨迹发展,逐步升级,顺应了世界经济产业结构调整的步伐,为其对外贸易的持续发展奠定了坚实的基础。日本对外贸易遵循的是动态比较优势原理,其经验对我国当前外贸发展具有重要的借鉴意义。 相似文献