Banks will have an even tougher time fending off nonbanking companies this year in the race to hold onto deposit market share, according to a study.

On Deloitte & Touche Consulting Group's annual top 10 list of banking trends, No. 1 for 1998 is a slowdown in revenue growth as competition for "wallet share" with mutual fund companies, insurers, and pension funds erodes banks' traditional customer base.

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