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This empirical study takes the merge of International Commercial Bank of China and Chiao Tung Bank into Mega International Commercial Bank (Mega Bank) in August, 2006, and the merge of Bank of Taiwan (BOT) and two banks of Central Trust of China as the study object. Taking four years before and after the merge as our observation period, this paper investigates the business growth indicators of operation performance, such as profitability, operating capability, and management ability, and five other indicators in three dimensions after merges among banks, and uses t-test to see if the merge enhances or reduces the performance. Through financial rate analysis, it found that BOT has an increase in loan-deposit ratio, and improves overdue loan ratio, but the increase in deposit growth rate and loan growth rate is not significant. In addition, in profitability such as ROE, and ROA, and management ability, including CAR and average earnings per employee, both indicators shows significant decline. As for Mega Bank, in operating capability, it makes improvement in loan-deposit ratio and overdue loan ratio, but the rise in deposit growth rate and loan growth rate is not significant. Besides, the profitability indicator, including ROE and ROA, and the management ability such as CAR and average earnings per employee both shows insignificant decline. Furthermore, with cross-comparison analysis, it’s discovered that after merge, , BOT outperforms Mega Bank in all indicatorsexcept CAR, and lower overdue loan ratio than International Commercial Bank of China although it’s not significant. Still, International Commercial Bank of Chinasignificantly outtakes BOT in performance on profitability (ROE, ROA), operating capability (loan-deposit ratio, deposit growth ratio, and loan growth ratio, though insignificant), and management ability (average earnings per employee) especially after merge.
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