在個體微結構的文獻中,大多數學者利用買賣價差、成交量或是週轉率等做為衡量流動性的指標。本文將採用Amihud(2002)ILLIQ指標做為進行台灣股市個股流動性的衡量方式,並利用報酬率的標準差、平均成交量、市場流動性平均值與收盤價做為解釋變數,來探討各解釋變數和流動性之間的關係,並觀測台灣股票市場在金融風暴發生的前後,股票市場流動性的異動。樣本取自於2005年發佈的台灣50ETF指數成份股的各檔股票做為探討對象,結果證實,本研究所提出的解釋變數都對個股流動性有顯著解釋能力,而且實證結果也發現,在金融風暴發生的前後,確實是可以看出許多個股的流動性有明顯的變化。
In the microstructure literature, most empirical studies used the bid-ask spread, trading volume or turnover to be proxies of asset liquidity. While this paper will use the Amihud(2002) ILLIQ to measure individual stock liquidity in Taiwan. Moreover, choosing return standard deviation, average trading volume, average market liquidity and closing price as the explanatory variables, this paper explores the relationship between these explanatory variables and individual stock liquidity. This paper also studies the influences of the financial crises in 2008 on the individual stock liquidity. The samples are selected from Taiwan 50ETF in 2005. The main results include (1) the explanatory variables have significant effects on individual stock liquidity (2) the liquidity of many stocks decline significantly after the financial crises in 2008.