本研究以台灣、中國發行美國存託憑證之企業為研究對象,並應用VAR模型與延遲變數(DELAY)分析原股與美國存託憑證的互動性、因果關係與個股之資訊調整速度,樣本期間為2001年1月至2008年12月。 實證結果發現台灣企業發行之美國存託憑證與其原股兩者之間為相互因果關係,而中國企業發行之美國存託憑證與其原股兩者之間為單向因果關係。此外實證結果顯示出台灣市場與美國市場的差異,有不同的資訊反應速度。在台灣市場,市值愈高的個股有較快速的資訊反應速度;而在美國市場,週轉率愈高的台灣ADR有較快速的資訊反應速度。 報酬不對稱對訊息調整的影響,發現台灣投資人對於市場好消息時,有較快速的訊息反應速度;而美國投資人對於市場好消息與壞消息,沒有顯著的差異。
This paper examines the speed of price adjustment in Taiwan, China stock market and American Depositary Receipts. We use a VAR model to show the interaction for stocks and American Depositary Receipts of Taiwan and China. The sample period of this study is from January, 2002 to December, 2008. The empirical results prove that two-way feedback relationship between stocks and ADRs of Taiwan, and we find the positive relationship between stocks and ADRs of China. Our analysis of firm characteristics suggests that the speed of stock price adjustment for Taiwan market is related to market value, while that for American market is related to turnover ratio. We also find asymmetric effects of returns on the speed of adjustment. Investors in Taiwan react more quickly to good news, while investors in America react identically to good news and bad news.