金融環境競爭日益激烈,金融機構多以合併來達到節省成本與提昇營業綜效。前人之研究指出合併宜慎選對象方能獲取較大的利益。不過,仍未有研究提出實證數據以供參考。本文則利用厚邊界概念與成本函數法,進行台灣47家本國銀行合併效益之事前性模擬估計,我們更進一步地將合併效益區分為因規模經濟、範疇經濟或因不同生產技術提升之成本節省。研究結果顯示:本國銀行間之合併將可產生顯著之成本節省。此外,不同成本結構之銀行間合併所能獲得之效益,亦比同成本結構銀行間合併之效益高;亦即合併效益除了來自規模經濟與範疇經濟外,亦有來自生產技術提升部分;而後者最大可產生超過30%之成本節省。
In recent years, a growing number of banks in Taiwan have considered using the mean of bank merger to obtain potential cost savings and scale or scope economies. This paper adopts the concept of thick frontier and cost function approach to simulate the potential cost savings from mergers of 47 Taiwanese domestic banks. We have also further decomposed such merger gains into gains from scale and scope economies and gains from x-efficiency improvement. The empirical results have shown that the cost savings from sample bank mergers are substantial for all merger cases. In addition, cost savings from bank mergers between different cost structure banks are found to be much higher than those from bank mergers between the same cost structure banks. The impact of adopting better production technology could result in an over 30% of cost savings from bank mergers.