本文利用晚近發展出來的單根檢定法以及共積檢定法，實証分析美、日兩國二次大戰以後企業購併與總體經濟變數間之關係。其實証方法與實証結果如下：運用ADF 檢定方法對購併、股價、國民生產毛額、利率，作單根檢定，發現美日兩國之購併、股價與國民生產毛額呈一階差分恆定狀態。

此外，本文應用Engle and Granger(1987) 的共積模型分析，將同樣為一

階差分恆定的變數做共積檢定，發現美日兩國之購併與股價、國民生產之間，皆具有長期共同移動的趨勢，因此可以建立一包含長、短期關係之誤差修正模型。本文之實証結果顯示：美國的企業購併與股價水準有正向且顯著之長期穩定關係，而與國民生產毛額則有負向且顯著的長期穩定關係；日本的企業購併與股價及國民生產毛額也有長期穩定之關係，惟影響方向與美國相反。另外，因果關係檢定結果顯示，美國之股價與利率對購併呈單向因果關係，而日本之股價與購併則呈雙向因果關係。由這些實証結果可知，購併風潮之形成，實肇因於總體經濟之波動，而不同國家之企業，由於法令規章、經濟結構、社會制度之不同，因而會有不同之反應。

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1.蔡麗茹(1991) ,「非恆定總體時間數列計量方法之分析與應用」未出版之博士論文。
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