``Wells Fargo's burgeoning share of the mortgage market - it made 1 out of 3 new mortgages in the first half of this year compared with 1 out of 10 in 2004 - is raising some red flags.

Concentration in any market is not good because it can lead to fewer choices and higher prices. But it's of special concern in the banking industry because of its key role in the economy. ''

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