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排序方式: 共有133条查询结果,搜索用时 375 毫秒
1.
V. Filipe Martins-da-Rocha 《Journal of Mathematical Economics》2003,39(8):863-889
The purpose of this paper is to provide an existence result of equilibria for economies with a measure space of agents, a non-trivial production sector and an infinite dimensional commodity space. The commodity space is modeled by an ordered separable Banach space whose positive cone has a non-empty interior. The discretization approach proposed in this paper, allows us to extend the existence results in Khan and Yannelis [Equilibrium in markets with a continuum of agents and commodities. In: Khan, M.A., Yannelis, N.C. (Eds.), Equilibrium Theory in Infinite Dimensional Spaces. Springer, Berlin, 1991] and Podczeck [Economic Theory 9 (1997) 585] to economies with a non-trivial production sector and with possibly non-ordered but convex preferences as well as partially ordered (possibly incomplete) but non-convex preferences. 相似文献
2.
3.
超奈奎斯特(Faster-than-Nyquist,FTN)速率传输可以有效提高频谱效率,但这种非正交传输方式引入的严重码间串扰相应提高了接收端的处理难度。针对该问题,设计了一种基于循环成块传输的低复杂度检测算法。最优检测被建模为无约束的二元二次规划(Boolean Quadratic Program,BQP)问题,为了求解该NP-hard问题,采用无穷范数约束松弛原问题的非凸可行解集,并基于次梯度下降法提出松弛问题的有效优化算法。数值仿真结果表明,所提算法在误比特率(Bit Error Rate,BER)性能上优于频域均衡,且在可接受的性能损失范围内算法执行效率远高于理论最优的最大似然序列估计(Maximum Likelihood Sequence Estimation,MLSE)。 相似文献
4.
We study convex risk measures describing the upper and lower bounds of a good deal bound, which is a subinterval of a no‐arbitrage pricing bound. We call such a convex risk measure a good deal valuation and give a set of equivalent conditions for its existence in terms of market. A good deal valuation is characterized by several equivalent properties and in particular, we see that a convex risk measure is a good deal valuation only if it is given as a risk indifference price. An application to shortfall risk measure is given. In addition, we show that the no‐free‐lunch (NFL) condition is equivalent to the existence of a relevant convex risk measure, which is a good deal valuation. The relevance turns out to be a condition for a good deal valuation to be reasonable. Further, we investigate conditions under which any good deal valuation is relevant. 相似文献
5.
Using a general notion of convex order, we derive general lower bounds for risk measures of aggregated positions under dependence uncertainty, and this in arbitrary dimensions and for heterogeneous models. We also prove sharpness of the bounds obtained when each marginal distribution has a decreasing density. The main result answers a long-standing open question and yields an insight in optimal dependence structures. A numerical algorithm provides bounds for quantities of interest in risk management. Furthermore, our numerical results suggest that the bounds obtained in this paper are generally sharp for a broader class of models. 相似文献
6.
Using duality methods, we prove several key properties of the indifference price π for contingent claims. The underlying market model is very general and the mathematical formulation is based on a duality naturally induced by the problem. In particular, the indifference price π turns out to be a convex risk measure on the Orlicz space induced by the utility function. 相似文献
7.
In this paper, for a process S , we establish a duality relation between Kp , the - closure of the space of claims in , which are attainable by "simple" strategies, and , all signed martingale measures with , where p ≥ 1, q ≥ 1 and . If there exists a with a.s., then Kp consists precisely of the random variables such that ϑ is predictable S -integrable and for all . The duality relation corresponding to the case p = q = 2 is used to investigate the Markowitz's problem of mean–variance portfolio optimization in an incomplete market of semimartingale model via martingale/convex duality method. The duality relationship between the mean–variance efficient portfolios and the variance-optimal signed martingale measure (VSMM) is established. It turns out that the so-called market price of risk is just the standard deviation of the VSMM. An illustrative example of application to a geometric Lévy processes model is also given. 相似文献
8.
U. Rösler 《Statistica Neerlandica》1995,49(1):83-93
We solve Problem 234 in Statistica Neerlandica by introducing the concept of slantedness. Distributions with a decreasing Lebesgue density are slanted to the right. This is no longer true for distributions on a lattice with decreasing density. Both kinds of distributions have positive central odd moments. 相似文献
9.
An algebraic theory of portfolio allocation 总被引:1,自引:0,他引:1
Summary. Using group and majorization theory, we explore what can be established about allocation of funds among assets when asymmetries
in the returns vector are carefully controlled. The key insight is that preferences over allocations can be partially ordered
via majorized convex hulls that have been generated by a permutation group. Group transitivity suffices to ensure complete
portfolio diversification. Point-wise stabilizer subgroups admit sectoral separability in fund allocations. We also bound
the admissible allocation vector by a set of linear constraints the coefficients of which are determined by group operations
on location and scale asymmetries in the rate of returns vector. For a distribution that is symmetric under a reflection group,
the linear constraints may be further strengthened whenever there exists an hyperplane that separates convex sets.
Received: May 15, 2001; revised version: March 20, 2002
RID="*"
ID="*" Journal paper No. J-19797 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 3463,
and supported by Hatch Act and State of Iowa funds.
Correspondence to: D. A. Hennessy 相似文献
10.
B. Dervaux H. Leleu E. Minvielle V. Valdmanis P. Aegerter B. Guidet 《International Journal of Production Economics》2009,120(2):585
By using a novel adaptation of the free-disposable hull analysis of productivity, we assess the medical and technical efficiency of patient care in 25 Parisian intensive care units (ICUs) during 2000. The robust free disposable hull (RFDH) as defined by [Cazals et al., 2002. Nonparametric frontier estimation: a robust approach. Journal of Econometrics 106, 1–25] reduces the impact outliers may have on findings by employing Monte-Carlo techniques and repeated sample selection. Among our key findings, there was no overall significant correlation between medical and technical efficiencies for all the ICUs, therefore performing well in one does not guarantee good performance in the other. We also found that over 80% of inefficiency is concentrated in less than 20% of the sampled patients. 相似文献