"In fact, roughly half of respondents to the ICBA survey say that overdraft fees constitute their most profitable non-depository and non-lending product, despite regulatory changes that have crimped their income potential."
So basically the article is completely wrong when it says:
> The most profitable source of income for banks is not mortgages, credit card fees or mutual funds, but the fees they charge clients for these short-term loans.
> The most profitable source of income for banks is not mortgages, credit card fees or mutual funds, but the fees they charge clients for these short-term loans.