Most retail bankers would agree with the assertion that 80% of their profits are provided by 20% of their customers. However, this well-worn rubric is misleading, in large part because it's often interpreted to mean that only those with superior wallet size are capable of creating profits for their banks.

The less elitist truth is that all income groups have the potential to become profitable bank customers. In fact, in some cases banks today earn more in aggregate from moderate and even low-income customers than they do from better-heeled ones.

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