本研究主要探討歐元導入是否會影響到金融市場中的股市波動性和風險貼水。本研究所選定的對象為歐盟會員國中的法國、德國、義大利、西班牙和英國。檢視導入歐元的國家和仍採用英鎊的英國之間股市波動性的變化。分析方法採用一般化自我迴歸條件異質變異模型(GARCH)、修正GARCH 模型(加入虛擬變數)、GARCH-in-Mean模型、以及採用平滑轉換模型(STR)模型來驗證。資料期間取自1995年1月至2004年6月樣本國家股票市場指數日資料,以歐元正式導入時間點為切割點。實證結果發現,歐元的導入僅對於經濟體質較佳的國家(如法國、德國)有正面的助益。其次,就採用歐元的四個國家而言,在歐元導入前,干擾衝擊造成的波動持續性程度較久,在歐元導入後,外生干擾衝擊對股票市場的波動持續現象卻反而有下降的趨勢。就結構轉變模型的觀點而言,歐元的導入並未影響歐元區國家股票市場的波動性,即使是非歐元國的英國,股價波動性亦未受到影響,此乃由於歐元導入訊息早在之前就已成為公開資訊,因而造成各國股票市場均出現提前反應的現象。
This study examines whether or not euro introduction influences the volatility of stock market and risk premium-five countries including France, German, Italy, Spain, and U.K. in both periods of the pre-and post-euro introduction. Using real data (i.e., the daily data of stock index from January/1995 to June/2004) of five countries' stock markets that react volatility parameter, this paper verifies the impact of euro introduction on the speed and quality of information transmission. Through the application of GARCH model, GARCH-in-Mean, and STR model, the finding results propose that euro introduction seems to bring a more benefit to France and Germany with stronger economy, and less to Italy and Spain. Besides, the disturbance shock to stock markets could persist for a long time in the pre-euro period, but it might decline in the post-euro period. Finally, this study also finds euro introduction has an insignificant effect on the volatility of stock markets, because of the information revealed.