What Banking in the Most Efficient?

Bank Cost to Income (%), 2017 or latest
Banking | June 17, 2018
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Based on a comparison of 109 countries in 2017, Lesotho ranked the highest in bank cost to income ratio with 5,466% followed by Belarus and Russia. On the other end of the scale was Maldives with 27.7%, Algeria with 28.1% and China with 30.6%.

Data for more countries are available at Bank Cost to Income Ratio indicator page.