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排序方式： 共有1033条查询结果，搜索用时 15 毫秒
31.
A.Y. Golubin 《Scandinavian actuarial journal》2016,2016(3):181-197
The paper studies the so-called individual risk model where both a policy of per-claim insurance and a policy of reinsurance are chosen jointly by the insurer in order to maximize his/her expected utility. The insurance and reinsurance premiums are defined by the expected value principle. The problem is solved under additional constraints on the reinsurer’s risk and the residual risk of the insured. It is shown that the solution to the problem is the following: The optimal reinsurance is a modification of stop-loss reinsurance policy, so-called stop-loss reinsurance with an upper limit; the optimal insurer’s indemnity is a combination of stop-loss- and deductible policies. The results are illustrated by a numerical example for the case of exponential utility function. The effects of changing model parameters on optimal insurance and reinsurance policies are considered. 相似文献
32.
Ting-Yi Wu 《新兴市场金融与贸易》2014,50(5):214-228
Abstract:This study proposes a dynamic hedge ratio, the combined ordinary least squares spread (COLSS), which combines the hedge ratio of ordinary least squares and the value of spread. Using this dynamic ratio for hedging with futures contracts, one can replace spot risk with spread risk. The COLSS captures not only the long-run equilibrium between spot and futures returns, but also the short-run deviation from equilibrium. The spread is forecast by one-period lagged stock market factors and high-order moments that are estimated by an options model. In the in-sample and out-of-sample tests, the COLSS strategy achieves significant risk reduction and outperforms the alternative models by a large utility improvement. 相似文献
33.
Bruno C. Giovannetti 《Review of Financial Economics》2013,22(4):169-179
“Focus on the downside, and the upside will take care of itself” is a famous quote among professional investors. By considering an agent who follows this advice, we reproduce the first and second moments of stock returns, risk-free rate and consumption growth. The agent's behavior toward risk is analogous to a relative risk aversion of about 3 under expected utility, the elasticity of intertemporal substitution is about 0.5 and the time discount factor is below 1. In particular, the proposed model separates time and risk preferences in an innovative way. 相似文献
34.
Yanick Farmer 《Journal of Risk Research》2013,16(10):1307-1319
The overall objective of this article is to demonstrate that in social ethics, certain problems related to decision-making are easier to resolve using conceptual tools borrowed from mathematics than using philosophical ethics theories, such as classical utilitarianism. With the help of a case study, the first part of the article will attempt to point out that if an agent bases his reasoning on the verbal and purely qualitative concepts of the classical utilitarian theory, he will find himself confronting ‘undecidable’ dilemmas, for which making a specific choice becomes almost arbitrary. The second part of the article proposes a more formal quantification of utility and attitude towards risk that can help the agent to overcome the uncertainties emanating from a strictly qualitative perception of the real world’s configuration. This method for decision-making is inspired by the works of Howard Raiffa, John von Neumann and Oskar Morgenstern. 相似文献
35.
Reinsurance is available for a reinsurance premium that is determined according to a convex premium principle H. The first insurer selects the reinsurance coverage that maximizes its expected utility. No conditions are imposed on the reinsurer's payment. The optimality condition involves the gradient of H. For several combinations of H and the first insurer's utility function, closed-form formulas for the optimal reinsurance are given. If H is a zero utility principle (for example, an exponential principle or an expectile principle), it is shown, by means of Borch's Theorem, that the optimal reinsurer's payment is a function of the total claim amount and that this function satisfies the so-called 1-Lipschitz condition. Frequently, authors impose these two conclusions as hypotheses at the outset. 相似文献
36.
单臂滑动调节式烧杯夹是一种刚面世的实用新型专利产品,它能将旧式烧杯夹无法夹紧的烧杯（直径达8-15cm）牢固地夹住,可避免在化学实验中因搅拌器影响使烧杯被振动滑脱而导致实验中断或实验安全事故发生。 相似文献
37.
We consider a continuous-time stochastic optimization problem with infinite horizon, linear dynamics, and cone constraints which includes as a particular case portfolio selection problems under transaction costs for models of stock and currency markets. Using an appropriate geometric formalism we show that the Bellman function is the unique viscosity solution of a HJB equation.Mathematics Subject Classification (1991):
60G44JEL Classification:
G13, G11This research was done at Munich University of Technology supported by a Mercator Guest Professorship of the German Science Foundation (Deutsche Forschungsgemeinschaft). The authors also express their thanks to Mark Davis, Steve Shreve, and Michael Taksar for useful discussions concerning the principle of dynamic programming. 相似文献
38.
This paper extends the literature on the estimation of expected utility and non-expected-utility preference functionals (and the consequent exploration of the superiority of non-expected-utility over expected utility preference functionals) to a comparison of two different ways (pairwise choice and complete ranking) of experimentally obtaining data on such preferences. What is revealed is that the magnitude of the subject error is clearly conditional on the elicitation method used and, rather alarmingly, that the preference functional apparently employed by the subject may also be conditional on the elicitation method. 相似文献
39.
关于深化农电体制改革的建议 总被引：2，自引：0，他引：2
总结了我国农电体制改革在构建农村供电所或营业所、促进农业经济发展等方面的成效,分析了县级供电企业存在的政企未完全分开、股份制改革困难较多、产权关系复杂等问题,提出在深化农电体制改革的过程中,应优先考虑上划方式结束对县级供电企业的代管,明晰农电资产所有权,对农电工管理采用农电业务外包方式,建立有效的农电投融资机制及合理的农村电价形成机制。 相似文献
40.