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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

人壽保險公司之資產配置迷思 / Asset allocation puzzle in Taiwan life insurance industry

許雅鳳 Unknown Date (has links)
本研究著重於分析發行大量長年期利率敏感型契約、高財務槓桿比例的人壽保險業中公司經理人之投資決策,發現台灣壽險業亦存在Canner et al.(1997)提出之資產配置迷思,亦即風險性資產中債券與股票之比率於不同壽險公司間有差異,與共同基金分離理論中陳述之風險態度不同之投資人所持有之債券與股票比率應相同不相符。本文嘗試以Sorensen(1999)提出之擬似動態規劃法(Quasi- dynamic Programming)最適化到期之效用函數,試算經理人於股票及不同到期固定收益債券之最適持有比例。且詳細探討不同風險偏好及投資期限對於壽險公司投資組合之影響。將業主權益之最適投資策略加上負債之複製投資組合成為策略性資產配置結果,並將其與目前台灣壽險公司之資產配置做比較。研究結果顯示: 1.以擬似動態規畫法求得之最適投資組合於不同風險態度下皆為長期債券以及股票。當經理人之風險趨避程度增加時,投資於股票之比例會減少、投資於債券之比例會增加。 2.比較台灣壽險公司之債券與股票配置比例與本研究之結果發現,本資公司之風險態度較外資公司積極,本資公司應提高其債券之持有比例。 本研究最後以Bajeux-Besnainou et al. (2001)提出之資產配置迷思解釋說明本資公司與外資公司持有之債券與股票比率之所以不同非因資產配置迷思之存在,本資公司與外資公司於風險性資產中持有之債券與股票比率是相同的,但因風險態度較為趨避之公司,投資於風險性資產比率下降、提高避險部位之配置,導致整體之股票與債券比率增加。 關鍵字:資產負債管理、策略性資產配置、擬似動態規劃法。
2

多期基金之最適資產配置:擬似動態規劃之應用 / Optimal Asset Allocation In Multi-period Fund Management: An Application of Quasi-Dynamic Programming

鄧益俗 Unknown Date (has links)
本研究探討長期信託基金(諸如退休基金,人壽保險公司等)之固定收益債券多期資產配置,利用時間可加性之效用函數描述投資者於投資期限時對財富大小之風險偏好程度,滿足基金之長期最適效益目標,為避免模型過於複雜,本文假設於動態完備市場中針對基金所持有之資產執行動態資產配置,建立財務動態調整機制以評量基金到期之獲利表現。為實際反應市場之風險程度,持有資產將利用隨機擴散過程表示,短期市場利率採用單因子Vasicek隨機模型表示,本文以給定金融市場之情境假設,說明不同到期日之債券為適當之獲利投資及避險工具,本研究之多期資產配置模型主要參考Cox與Huang (1989, 1991)與Sorensen (1999),將未來財富過程利用平賭過程表示,給定不同投資限制條件、風險偏好程度與市場系統風險,以擬似動態規劃實際計算與比較每期之最適資產配置。 / This study attempts to investigate the hedging behavior through multi-period asset allocation strategy for the long-term fund manager, i.e., pension fund managers, life insurers, etc. Time additive utility function is employed to depict the risk preference of the investors during his investment time horizon. Based on their long-duration liabilities, assets held by the fund manager are employed in hedging and speculating under dynamic complete market assumption. To fully reflect the financial risks from the market, a risk management mechanism is implemented to monitor the long-term financial soundness. Short-term interest rate model proposed by Vasicek is employed to characterize the diffusion pattern of the invested assets. Current financial market information are incorporated and investigated to portray the hedging strategy through fixed income securities with various maturities. The quasi-dynamic approach proposed in Cox and Huang (1989, 1991) and Sorensen (1999) are implemented to construct the optimal asset allocation model. The optimal strategy is examined through maximizing the indirect utility function through the optimal growth portfolio. Finally, the hedging behaviors are compared and fully explored under various market scenarios.

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