补贴概念与效果

补贴是一个相当复杂的议题,其复杂性不仅表现在概念上,也表现在它可能产生的效果上。补贴可能增加也可能降低其受体的利润水平;可能对国际贸易产生扭曲效果,其影响也可能仅限于国内;可能有助于政府实现其意欲达成的目标,也可能背离其初衷;可能增加或降低政府收益,也可能无影响。把补贴宽泛地界定为有可能在短期、中期或长期对其受体的利润水平产生影响的政府作为(或不作为),有助于使决策者把关注重点转向补贴效果,从而有利于其做出应否维持、增加、减少或消除特定补贴的判断。     

Expiration day effects of stock index derivatives in Germany

There is a significant increase in trading volume on quarterly futures expiration days in Germany. Delays in the opening for the majority of index stocks indicate that a large part of this extraordinary volume is indeed traded right at the opening of the market. an increase in trading activity is also observed over the 10-minute settlement period for index options. Volatility remains unchanged around the expiration of a futures contract. an increase is found for the 10-minute settlement period of DAX options. Return reversals as the measure for the economic costs of contract expirations are significantly higher when a futures contract expires at the open. When an option expires at the close no clear pattern for reversals can be found.     

Understanding the Implied Volatility Surface for Options on a Diversified Index

This paper describes a two-factor model for a diversified index that attempts to explain both the leverage effect and the implied volatility skews that are characteristic of index options. Our formulation is based on an analysis of the growth optimal portfolio and a corresponding random market activity time where the discounted growth optimal portfolio is expressed as a time transformed squared Bessel process of dimension four. It turns out that for this index model an equivalent risk neutral martingale measure does not exist because the corresponding Radon-Nikodym derivative process is a strict local martingale. However, a consistent pricing and hedging framework is established by using the benchmark approach. The proposed model, which includes a random initial condition for market activity, generates implied volatility surfaces for European call and put options that are typically observed in real markets. The paper also examines the price differences of binary options for the proposed model and their Black-Scholes counterparts. Mathematics Subject Classification: primary 90A12; secondary 60G30; 62P20 JEL Classification: G10, G13     

The benefits of non-radial vs. radial super-efficiency DEA: an application to burden-sharing amongst NATO member nations

Using radial super-efficiency data envelopment analysis (DEA) has improved the discriminating performance across efficient decision-making units (DMUs). This paper extends the super-efficiency approach to a non-radial super-efficiency DEA (NRSE-DEA) index. NRSE-DEA is shown to be invariant to units of input (output) measurement. NRSE-DEA is illustrated here via an application to NATO burden-sharing assessment in which the DMUs are the member nations of NATO. The NRSE-DEA provides additional insights into the ranking of efficient countries, suggesting which are absorbing a particularly large share of NATO responsibilities. The NRSE-DEA generates a smaller set of efficient DMUs. This, in turn, provides more discriminatory power, a more accurate measure of super-efficiency, a more meaningful ranking of the efficient burden sharing countries, and a more reliable assessment of contributions by NATO members, amongst other policy issues.     

码移键控系统的性能分析

讨论了码移键控(CSK)基本原理、基于数字匹配滤波器(DMF)的快速捕获结构和用相关乘法器代替数字匹配滤波器的快速捕获结构,并对CSK系统的接收性能进行数学分析,得到了数据码错误率公式。     

一种实用的域内标记算法及其公平性

本文从6个方面对WTO有关协定的英文文本的语言特点作了分析,结 合翻译实践经验,对其翻译提出些建设性的意见。     

The "Invisible Hand"

The argument of the "Invisible Hand" is that the system of free enterprise benefits society in general even though it is not the aim of any particular economic agent to do that. This article proposes an analysis of why this is so. The key is that the morality of the market forbids only force and fraud; it does not require people to do good to others. Nevertheless, when all transactions are voluntary to both parties, that is exactly what we can expect to happen. This is both because the sum of the benefits of innumerable transactions, which are beneficial to both parties, is very great, but also and especially because of Positive Externalities. People use the particular products and services they get in market exchanges in ways that benefit others in ways not at all foreseen by the agents to those transactions at the time. These externalities range from the benefits of invention and ingenuity to the exercise of charity and philanthropy, all of which flourish in developed capitalist societies.     

武汉金融安全区模式设计与研究

金融安全与稳定直接关系到一个国家或地区的经济安全与社会稳定。一个地区 ,在突出的支付风险得以逐一化解之后 ,适时启动创建金融安全区工程 ,并以此全面提高金融监管水平 ,实现区域金融业持续稳健发展已经成为当前我们面临的重要课题。本文在论证武汉市开展创建金融安全区的必要性和可行性的基础上 ,提出了构建以武汉金安指数为核心的指标监测体系、具体创建规划以及相应运行规程。     

国有企业"债转股"政策:问题与对策

国有企业实施“债转股”政策已近四年。本文在跟踪调查的基础上,总结国有企业实施“债转股”政策存在的问题并提出完善的对策。尽管“债转股”政策的实施已经取得一定的政策效果。但是,它无法从根本上解决国有企业与国有商业银行之间的债务问题。应该从市场经济体制和现代企业制度建设的长远发展观点,制定与“债转股”政策相配套的各项改革制度。     

A Bayesian-like estimator of the process capability index Cpmk

Pearn et al. (1992) proposed the capability index C_pmk, and investigated the statistical properties of its natural estimator for stable normal processes with constant mean μ. Chen and Hsu (1995) showed that under general conditions the asymptotic distribution of is normal if μ≠m, and is a linear combination of the normal and the folded-normal distributions if μ=m, where m is the mid-point between the upper and the lower specification limits. In this paper, we consider a new estimator for stable processes under a different (more realistic) condition on process mean, namely, P (μ≥m)=p, 0≤p≤1. We obtain the exact distribution, the expected value, and the variance of under normality assumption. We show that for P (μ≥m)=0, or 1, the new estimator is the MLE of C_pmk, which is asymptotically efficient. In addition, we show that under general conditions is consistent and is asymptotically unbiased. We also show that the asymptotic distribution of is a mixture of two normal distributions. RID="*" ID="*"  The research was partially supported by National Science Council of the Republic of China (NSC-89-2213-E-346-003).