本文以2001~2015年間，臺灣地區塑膠產業22家公司的縱橫資料為樣本，實證估計該產業整體的投資行為。 估計結果如下：Tobin’s q 對投資比的影響並不顯著，而財務槓桿比與新增債務比則具有顯著的正面影響。然而，近五年來新增債務比對投資比的影響持續朝正向擴大。最後，就各變數對投資比的貢獻度而言，近五年來Tobin’s q的變動居首位。 This thesis takes the penal data from 22 companies in Taiwan’s plastic industry as sample to estimate their investment behavior. The estimated results have shown that Tobin’s q does not significantly affect the investment ratio, while leverage ratio and new debt ratio brings about significant positive effects during the period between 2001 and 2015. However, the sign of Tobin’s q has turned into significantly positive during the recent five years. Finally, is so far as the contribution to investment ratio is concerned, Tobin’s q has played the most important role recently.
