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Internationalization and globalization of the bank industry are inevitable trends, with higher risk and profit accompanying them. To reduce the risk of banks, the Bank for International Settlements has set the minimum capital adequacy ratio to be 8%, but the financial crisis in 2008 affected financial development quite severely. Hence, in September 2010, Basel III set even stricter capital requirements to gradually increase Core Tier 1 capital from 2% to 4.5%. Tier 1 capital is to be raised from 4% to 6%, while the capital adequacy ratio should reach 10.5%. Higher capital requirements can raise the ability of banks to respond to losses and to endure extreme risk, thus facilitating management restoration of banks. However, the higher capital requirements may also result in a reduction of loans as the banks try to retain more capitals. This increases operation costs and reduces profits and hence is detrimental to the operational performance of the bank industry. Banks raised the issue of cost and risk increase in implementing capital adequacy ratio, Mostly accompanied by how to increase profits, From the overall capital adequacy ratio of view,Only a small part of the literature mentions the impact of different capital on risk tolerance and the actual operation of banks. Our research will cut from this part, The Taiwan government has gradually instructed domestic banks to raise the quantity and quality of their capital adequacy ratio to meet the higher level of Basel III standard. This study employs the two-stage bootstrapped truncated regression to investigate the impacts on the efficiency of Taiwan domestic commercial banks due to the increases in required Core, Tier 1, and total capital adequacy ratios. The results show that, from 2011 to 2013, the increased Core and Tier 1 capital adequacy ratios have significant negative effects. Therefore, raising the levels of Core and Tier 1 capital ratios gradually lessens the negative impact on bank performance. Eventually, in the long run, a higher quality of the capital adequacy ratio will improve the stability of the financial market and make the banking industry sounder and safer. The results are consistent with the schedule and intention set by Basel III.
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