自1970年代起, 就有財務經濟學家注意到一現象的存在: 一國的投資者所持有的外國資產占其所擁有的財富的比例, 與理論上所得的比例相較之下, 小了許多. 也就是, 投資者所持有的資產仍集中於國內資產. 這一現象稱為"本國偏向". 本文的主要目的是希望能夠為 "本國偏向" 的現象,提出理論上的可能解釋. 我們藉由在模型中導入Knightian 不確定性下, 投資者對報酬分配不確定厭惡, 探討投資者國際資產選擇行為. 我們得到了在Knightian 不確定性下, 投資者所持有的外國風險性資產的比例確有偏低的傾向.又若國際資本市場的訊息不對稱, 而造成投資者對於本國資本市場的報酬分配不確定程度, 異於對外國資本市場的報酬分配不確定程度時, 投資者會因對外國資本市場的報酬分配不確定程度較高, 而再降低外國風險性資產的持有比例.由所得結果, 可以發現投資者在估計風險性資產的可能報酬的機率分配時, 所產生的不確定性, 很有可能是迼成投資在做國際資產選擇時, 仍將大部份的財富集中於國內的資本市場的原因之一. 這提供了在未來探討 "本國偏向" 現象時, 一個可以參考的方向. / This paper studies the "home bias" puzzle. With homw bias,
domestic investors hold a substantially larger proportion of thier wealth portfolios in domestic assets than standard portfolio theory. In the absence of th home bias, investors would optimally diversify away domestic output risk.
We suggest that decision-makers do not have full knowledge of the probabilities of the state fo nature. Using a partial equilibrium representiative agent model, we show how the agent allocates his wealth by the presence of Knightian uncertainty.
Under some conditions, we derive and simulate the patterns of diversification for agent who maximizes expected utility and simultaneously minimizes uncertainty of probability, attaching less weight to foreign risky assets. Consequently, we argue that the presence of Knightian uncertainty should be added to the explanatory factors that account for the observed diversification patterns.
| Identifer | oai:union.ndltd.org:CHENGCHI/B2002001898 |
| Creators | 林曉伶, Lin, Hsiao-Ling |
| Publisher | 國立政治大學 |
| Source Sets | National Chengchi University Libraries |
| Language | 中文 |
| Detected Language | English |
| Type | text |
| Rights | Copyright © nccu library on behalf of the copyright holders |
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