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復(fù)合二項(xiàng)對(duì)偶模型的最優(yōu)分紅問題

2015-03-26 04:29:22鄧麗激揚(yáng)
經(jīng)濟(jì)數(shù)學(xué) 2014年4期

鄧麗 激揚(yáng)

摘要研究復(fù)合二項(xiàng)對(duì)偶模型的最優(yōu)分紅問題, 通過分析HJB方程得到了最優(yōu)分紅策略和相應(yīng)的最優(yōu)值函數(shù)之間的關(guān)系以及最優(yōu)值函數(shù)的簡單計(jì)算方法. 通過討論最優(yōu)紅利策略的一些性質(zhì)得到了最優(yōu)值函數(shù)的可無限逼近的上界和下界.

關(guān)鍵詞對(duì)偶模型;HJB方程;壓縮映射;最優(yōu)分紅策略

中圖分類號(hào)O211.6 文獻(xiàn)標(biāo)識(shí)碼A

AbstractThis paper discussed the problem of optimal dividendpayment in compound binomial dual model. The relationship between the optimal dividend strategy and the corresponding optimal value function was found by analysing the HJB equation, and a simple algorithm was obtained for calculating the optimal value function. From the properties of the optimal dividend strategy, an upper bound and a lower bound of the optimal value function were derived.

Key wordsdual model; HJB equation; contraction mapping; optimal dividend strategy

1引言

分紅問題的提出可以追溯到De Finetti1在紐約第15屆國際精算師大會(huì)上發(fā)表的一篇文章,他認(rèn)為在風(fēng)險(xiǎn)模型中考慮分紅更切實(shí)際. 目前研究得最多的分紅策略有:Barrier策略2-4和Threshold策略5-9. 隨著金融管理、公司業(yè)務(wù)和保險(xiǎn)業(yè)務(wù)的發(fā)展,經(jīng)典風(fēng)險(xiǎn)模型的對(duì)偶模型越來越受到重視10-14, 討論相對(duì)較多的是連續(xù)時(shí)間經(jīng)典風(fēng)險(xiǎn)模型的最優(yōu)分紅問題,例如:Avanzi等10運(yùn)用拉普拉斯變換方法討論了復(fù)合Poisson對(duì)偶模型的最優(yōu)紅利Barrier的確定方法;Gerber等11討論了復(fù)合Poisson對(duì)偶模型的最優(yōu)紅利Barrier的一些近似方法. 然而離散時(shí)間的最優(yōu)分紅問題顯然還沒有得到足夠的重視,盡管De Finetti11最開始討論紅利問題就是在一個(gè)離散模型中. 對(duì)偶模型可描述為:

本文研究復(fù)合二項(xiàng)對(duì)偶模型的最優(yōu)分紅問題,發(fā)現(xiàn)最優(yōu)值函數(shù)滿足一個(gè)離散的哈密頓-雅可比 -貝爾曼(HJB)方程,并運(yùn)用壓縮映射原理證明最優(yōu)值函數(shù)是這個(gè)方程的唯一解,從而得到了最優(yōu)分紅策略的計(jì)算方法. 通過討論最優(yōu)紅利策略的一些性質(zhì)本文構(gòu)造出了最優(yōu)值函數(shù)的可無限逼近的一個(gè)上界和一個(gè)下界,以便能運(yùn)用遞歸算法在Matlab中進(jìn)行數(shù)值計(jì)算.

2基本模型假設(shè)

參考文獻(xiàn)

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