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   1267篇
  免费   66篇
财政金融   278篇
工业经济   106篇
计划管理   198篇
经济学   283篇
综合类   19篇
运输经济   21篇
旅游经济   43篇
贸易经济   238篇
农业经济   65篇
经济概况   82篇
  2024年   2篇
  2023年   12篇
  2022年   9篇
  2021年   18篇
  2020年   26篇
  2019年   40篇
  2018年   49篇
  2017年   53篇
  2016年   55篇
  2015年   31篇
  2014年   48篇
  2013年   153篇
  2012年   56篇
  2011年   53篇
  2010年   79篇
  2009年   58篇
  2008年   64篇
  2007年   49篇
  2006年   37篇
  2005年   36篇
  2004年   42篇
  2003年   34篇
  2002年   37篇
  2001年   23篇
  2000年   36篇
  1999年   19篇
  1998年   25篇
  1997年   18篇
  1996年   14篇
  1995年   19篇
  1994年   24篇
  1993年   10篇
  1992年   12篇
  1991年   10篇
  1990年   14篇
  1989年   6篇
  1988年   6篇
  1987年   4篇
  1986年   4篇
  1985年   4篇
  1984年   6篇
  1983年   6篇
  1982年   5篇
  1980年   7篇
  1979年   4篇
  1978年   3篇
  1977年   3篇
  1973年   2篇
  1972年   1篇
  1971年   4篇
排序方式: 共有1333条查询结果,搜索用时 31 毫秒
71.
This paper examines investors’ expectations of loss persistence. I develop a model to forecast loss firms’ future earnings based on Joos and Plesko, The Accounting Review 80: 847–870, (2005). This model produces smaller forecast errors than two random walk models and a model that assumes losses are transitory. The results suggest that investors do not fully distinguish the differences in loss persistence captured by the model and instead appear to assume that all losses are transitory. Consequently, investors are surprised by future announcements of negative earnings for firms with predicted persistent losses, and these firms experience significantly negative abnormal returns over the following four quarters. Additional results indicate that the future negative returns of firms with predicted persistent losses are smaller in magnitude when these firms are followed by analysts. The results are robust to controls for various price anomalies and are not driven by short sale constraints.  相似文献   
72.
73.
Manufacturing has received increased attention in recent years, as it has enhanced its importance in the economy with output and employment gains and as a driving force of U.S. exports. Nonetheless, the sector faces serious challenges as well as opportunities. The challenges are weak global economic growth, burdensome taxes and regulation, and a labor force that is unprepared to meet twenty-first century needs. Opportunities, however, are likely to more than offset the challenges. These are an improving energy environment, an improved climate for international trade, strong productivity growth, and continued strength in innovation.  相似文献   
74.
Abstract

Since its inception, the effectiveness of no-fault legislation has been highly debated. Although some research suggests that no-fault laws are effective in reducing costs, other evidence suggests that the current no-fault systems may not meet the original objectives. This study provides a detailed assessment of the relation of no-fault laws and automobile insurance losses for the period 1994 to 2007. By examining total automobile insurance losses along with liability and personal injury protection losses, we are able to determine if and how specific provisions of the laws are related to claims costs. We find a negative relation between the presence of a no-fault law and total losses, which suggests that no-fault systems are associated with lower losses than the traditional tort system. In addition, an examination of no-fault-only states suggests that specific provisions of no-fault laws, such as thresholds and limitations on benefits, have some effect on losses. With the sunset of Colorado’s no-fault legislation in 2003, the recent passage of Personal Injury Protection Reform in Florida, and proposed federal choice legislation, the overall impact of no-fault as well as the specific components of the laws are of heightened importance to consumers, insurers, and lawmakers.  相似文献   
75.
Background:

Venous thromboembolism (VTE), comprised of deep vein thrombosis (DVT) and pulmonary embolism (PE), is commonly treated with a low-molecular-weight heparin such as enoxaparin plus a vitamin K antagonist (VKA) to prevent recurrence. Administration of enoxaparin?+?VKA is hampered by complexities of laboratory monitoring and frequent dose adjustments. Rivaroxaban, an orally administered anticoagulant, has been compared with enoxaparin?+?VKA in the EINSTEIN trials. The objective was to evaluate the cost-effectiveness of rivaroxaban compared with enoxaparin?+?VKA as anticoagulation treatment for acute, symptomatic, objectively-confirmed DVT or PE.

Methods:

A Markov model was built to evaluate the costs, quality-adjusted life-years (QALYs), and incremental cost-effectiveness ratios associated with rivaroxaban compared to enoxaparin?+?VKA in adult patients treated for acute DVT or PE. All patients entered the model in the ‘on-treatment’ state upon commencement of oral rivaroxaban or enoxaparin?+?VKA for 3, 6, or 12 months. Transition probabilities were obtained from the EINSTEIN trials during treatment and published literature after treatment. A 3-month cycle length, US payer perspective ($2012), 5-year time horizon and a 3% annual discount rate were used.

Results:

Treatment with rivaroxaban cost $2,448 per-patient less and was associated with 0.0058 more QALYs compared with enoxaparin?+?VKA, making it a dominant economic strategy. Upon one-way sensitivity analysis, the model’s results were sensitive to the reduction in index VTE hospitalization length-of-stay associated with rivaroxaban compared with enoxaparin?+?VKA. At a willingness-to-pay threshold of $50,000/QALY, probabilistic sensitivity analysis showed rivaroxaban to be cost-effective compared with enoxaparin?+?VKA approximately 76% of the time.

Limitations:

The model did not account for the benefits associated with an oral and minimally invasive administration of rivaroxaban. ‘Real-world’ applicability is limited because data from the EINSTEIN trials were used in the model. Also, resource utilization and costs were based on the US healthcare system.

Conclusion:

Rivaroxaban is a cost-effective option for anticoagulation treatment of acute VTE patients.  相似文献   
76.
The purpose of this study was to explore the relationship between mandatory food safety training and certification and inspection results of chain restaurants and independent restaurants, using current food safety inspection results of food service establishments in Central Florida. More specifically, this study examines whether there is any statistically significant difference in the violation frequency among chain and independent restaurants. Reducing the risk of any foodborne illness is a critical strategy that industry stakeholders should pursue in an area dominated by tourism such as Orlando, Florida. A one-way ANOVA was used to determine the differences between the two types of restaurants. Findings indicate that there is significant difference between chain and independent restaurants for critical violations. No difference was found when comparing chain verses independent restaurants for non-critical violations.  相似文献   
77.
This paper addresses the problem of cultural change in relation to tourism. It will be argued that tourism research has tended to be theorised in terms of static models predicated on the assumptions of unilinear development, and cultural change being accounted for by a shift from one defined state into another. Beginning with a critique of the 'container model' of culture, this paper then draws on recent anthropological and sociological developments concerned with globalisation to critically examine the utility of the concept of hybridity. In conclusion, this paper will argue that what is required is a transformative and processual approach that is capable of accounting for the dynamic interplay of cultural change at both a micro and macro level.  相似文献   
78.
We examine whether the unethical actions of marketplace brands (e.g., the Volkswagen emissions scandal) hurt the ethical perceptions of competing brands (e.g., Ford, BMW). Across two studies, we find evidence for this unethical spillover effect and show that it can negatively affect consumers’ liking and purchase intentions for a competing brand. The results show that the spillover effect (1) only occurs for similar competitors and (2) is moderated by construal level (CL). Specifically, the spillover effect is more likely to occur when consumers focus on the finer details of the unethical brand’s transgression (i.e., low CL) but not when they focus on the bigger picture of the transgression (i.e., high CL). Thus, while it is intuitively appealing to assume that brands may benefit from a competitor’s foible, this research indicates that competitors may be hurt by a similar brand’s wrongdoing.  相似文献   
79.
Although theory suggests that corporate hedging can increase shareholder value in the presence of capital market imperfections, empirical studies show overall mixed support for rationales of hedging with derivatives. Although various empirical challenges and limitations advise some caution with regard to the interpretation of the existing evidence, the results are consistent with derivatives use being just one part of a broader financial strategy that considers the type and level of financial risks, the availability of risk management tools, and the operating environment of the firm. Moreover, corporations rely heavily on pass‐through, operational hedging, and foreign currency debt to manage financial risk.  相似文献   
80.
Contracts for Difference (CFDs) are a significant financial innovation in the design of futures contracts. Over‐the‐counter trading in the UK is significant and has created controversy, but there is no published academic research into the design, pricing, and effects of CFDs. This study analyzes CFD contract design and pricing. It uses a unique database of trades and quotes on exchange traded equity CFDs introduced by the Australian Securities Exchange to test theoretical pricing relationships, and draws out implications for successful design and trading arrangements for the introduction of new derivative contracts. © 2010 Wiley Periodicals, Inc. Jrl Fut Mark  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