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251.
Jennifer Alonso-García María del Carmen Boado-Penas Pierre Devolder 《Scandinavian actuarial journal》2018,2018(2):85-108
The notional defined contribution model combines pay-as-you-go financing and a defined contribution pension formula. This paper aims to demonstrate the extent to which liquidity and solvency indicators are affected by fluctuations in economic and demographic conditions and to explore the introduction of an automatic balancing mechanism (ABM) into the pension scheme. We demonstrate that the introduction of an ABM reduces the volatility of the buffer fund and that, in most cases, the automatic mechanism that re-establishes solvency produces the highest value of the risk-adjusted notional factor. 相似文献
252.
Tina Hviid Rydberg 《Finance and Stochastics》1997,1(3):251-257
Simple sufficient conditions for the existence of a unique equivalent martingale measure are provided. Furthermore, these
conditions give us a handle on situations where an equivalent martingale measure cannot exist. The existence of a unique equivalent
martingale measure is of relevance to problems in mathematical finance. Two examples of models for which the question of existence
was unresolved are studied. By means of our results existence of a unique equivalent measure up to an explosion time is proved. 相似文献
253.
我国海洋资源开发综合效益的评价探讨 总被引:2,自引:0,他引:2
从海洋资源开发形成的产业产值效益角度,选取海米岸线产值、人均产值、占GDP比重等3个相对指标,采用均方差权重法对我国沿海备省、市区海洋资源开发的综合效益做出评价;依据沿海各省、市区海洋资源开发的综合效益评价值及排序结果,把该区划分为3种类型:。低等综合效益开发区,中等综合效益开发区,高等综合效益开发区;得出海洋资源开发的综合效益不仅与资源条件有关,还与各地的经济发展水平、人口数量及其协调程度有关等结论。 相似文献
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257.
This paper presents hedging strategies for European and exotic options in a Lévy market. By applying Taylor’s theorem, dynamic hedging portfolios are constructed under different market assumptions, such as the existence of power jump assets or moment swaps. In the case of European options or baskets of European options, static hedging is implemented. It is shown that perfect hedging can be achieved. Delta and gamma hedging strategies are extended to higher moment hedging by investing in other traded derivatives depending on the same underlying asset. This development is of practical importance as such other derivatives might be readily available. Moment swaps or power jump assets are not typically liquidly traded. It is shown how minimal variance portfolios can be used to hedge the higher order terms in a Taylor expansion of the pricing function, investing only in a risk‐free bank account, the underlying asset, and potentially variance swaps. The numerical algorithms and performance of the hedging strategies are presented, showing the practical utility of the derived results. 相似文献
258.
The purpose of this research is to evaluate differences in consumer perception before and after national traumatic events such as the terrorist attacks that took place on 11 September 2001. The authors found a significant difference in consumer ethnocentrism, patriotism, time management, attitude towards regulation of business and product quality following the terrorist attacks. These differences impact consumer purchase decision processes and become important to businesses that are targeting these consumers with their product offerings. In addition, marketing managers' understanding of change in consumer perceptions and attitude should impact how consumer products are marketed. 相似文献
259.
P. J. Dawson 《Journal of Agricultural Economics》2015,66(1):20-35
Agricultural prices rose dramatically in 2007 and have subsequently fluctuated at high levels. This paper estimates the volatility of daily wheat futures prices on the Euronext/London International Financial Futures and Options Exchange for 1996–2012 using an exponential generalised autoregressive conditional heteroscedasticity model with a constant (price) elasticity of variance (CEV) and a broken trend. Results show that volatility is highly persistent; there is a structural break in volatility in June 2007 when volatility rose by 10%; subsequently, the wheat futures price has become more volatile; and the CEV is 0.04. 相似文献
260.
快速城镇化地区不同生计类型农户耕地利用集约度评价 ——以上海市青浦区为例 总被引:1,自引:0,他引:1
研究目的:针对快速城镇化地区农户生计分化现象,以上海市青浦区为例,对不同生计策略类型农户的耕地利用集约度进行评价,并分析其影响因素,以期为改善农户土地利用行为、实现土地资源合理高效利用与农户生计可持续发展提供政策参考。研究方法:运用价值形态测度方法核算各生计类型农户的耕地利用集约度,以两水平方差成分模型确定耕地利用集约度影响因素。研究结果:(1)不同生计策略类型农户耕地利用集约度存在差异性,大小顺序依次为专业农业型、传统农业型、农业兼业型、非农兼业型,劳动集约度与资本集约度排序与之基本一致;(2)同一生计策略类型农户的耕地利用集约度存在相似性,耕地利用集约度的总变异中有24.32%是由农户生计策略类型不同而引起的,水平一中农业收入比重、农业补贴、耕地面积、地块平均离家距离、农户离集镇距离与水平二中是否兼业等是影响农户耕地利用集约度的显著因素;(3)模型拟合效果评价表明该方法具有可行性。研究结论:耕地利用集约度不仅与农户自身禀赋有关,而且受生计类型影响,政府相关部门应结合当地实际情况引导农户对这两方面进行调整或完善。 相似文献