我國金融機構產業在政府開放新銀行設立後，進入百家爭鳴的時代，市場競爭非常激烈，在這種競爭環境下，金融機構往往經由合併以持續改善其經營環境及獲利能力，而在探討銀行業的購併活動中，只看財務比率不足以顯示購併前後的績效差別，因財務比率往往是一種短期性指標，無法正確的反映出銀行的長期績效，故在衡量台灣地區銀行業購併前後之績效評估上應以經濟觀點探討之。
就本研究而言， 採用Fourier-Flexible成本函數型式(Fourier-Flexible cost function)，經由此成本函數求出樣本銀行之成本效率值、規模經濟及範疇經濟，將各樣本銀行相互之間比較。繼之，利用市場集中度、佔有率、管理效率、規模效率當作解釋變數，使用市場權益價值-資產報酬率(Return of Assets, ROA)及權益報酬率(Return of Equity, ROE)分別當作獲利能力指標進行研究，以結構-行為-績效假說、相對市場力量假說、管理效率假說及規模效率假說四種假說相互配合，以探究銀行業購併之獲利能力分析，可獲得下列結論：
(一)國內銀行購併信合社期間大都在民國八十六至八十八間，但概括承受情況多屬不佳，其內部營運上一直以來存有弊端，要於購併後近年內立竿見影，可能仍須一段時間，故大部分發生購併行為之銀行，似乎還無法在產品整合上及成本縮減上獲得顯著性效果，致使購併後成本效率不升反降居多。
(二)經由若干年之整頓，由本研究結果看來，除華僑、中興、台新、安泰以達規模經濟之效果，其他主併銀行仍有發展空間。
(三)近年來，由於利率走低及企業財務漸趨靈活下，金融體系結構為之丕變，產出組合多元化為勢在必行之事，以本結果言之，除主併銀行於購併前後皆具有範疇經濟外，大部分樣本銀行亦具有範疇經濟。
(四)本文探討銀行購併動機研究，以ROA結果言之，端看購併是否會帶給主併銀行增加獨佔力、提高競爭優勢及增加額外寡占利潤為目標，以及於永續經營下，追求規模經濟為訴求，以此說明銀行業購併之動機，故引用結構-行為-績效假說及規模效率假說解釋購併行為。而購併後主併銀行其獲利能力主要出現在ROA較具顯著性效果。

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目錄
第一章 緒論..................................1-3
第一節 研究動機................................1
第二節 研究目的................................2
第三節 研究方法及架構..........................3
第二章 文獻回顧.............................4-17
第一節 購併的理論基礎及動機....................4
第二節 銀行業的投入與產出......................6
第三節 成本效率原則與估計方法及函數型態之選擇..7
第四節 國內外銀行業購併之相關文獻探討.........11
第三章 理論與實證模型之建立.................8-25
第一節 理論模型...............................18
第二節 實證模型及實證內容之建立...............20
第四章 資料設定與實證結果..................26-48
第一節 研究範圍及研究對象.....................26
第二節 變數說明及資料來源.....................26
第三節 成本邊界函數估計之實證結果.............29
第四節 本國銀行業購併動機研究及獲利能力分析之實證結果..........................................35
第五章 結論與建議..........................49-51
參考文獻...................................52-56
中文部分......................................52
英文部分......................................53
圖表目錄
(表一)十家樣本銀行的創立時間及概括承受狀況....40
(表二)資料變數說明簡表........................41
(表三)2001年12月底全體樣本銀行之財務結構......42
(表四)成本邊界函數之估計結果..................43
(表五)主併銀行之購併前後成本效率、規模經濟及範疇經濟............................................44
(表六)全體樣本銀行之成本效率、規模經濟及範疇經濟45
(表七)各家樣本銀行之產出預期函數..............46
(表八)全體樣本銀行之ROA估計結果...............47
(表九)主併銀行於購併前及購併後之ROA估計結果...47
(表十)銀行業於解除管制前、後之ROA估計結果.....47
(表十一)全體樣本銀行之ROE估計結果.............48
(表十二)主併銀行於購併前及購併後之ROE估計結果.48
(表十三)銀行業於解除管制前、後之ROE估計結果...48

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歐陽遠芬、陳碧糸秀(2000),「銀行的購併與經營績效-規模經濟、範疇經濟與效率之分析」,臺灣銀行季刊,52(3):1-18。
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