A new study shows midsize banks have the edge in making money from their retail customers.

Banks in the $10 billion to $35 billion category led the industry with $153 of profit per customer last year, according to Andersen Consulting. Those with less than $10 billion of assets earned only $108; "large" banks, with $35 billion to $80 billion of assets, made $134; and "super-large banks," with assets of more than $80 billion, made only $113 per customer, the firm said Thursday.

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