Investor confidence among affluent investors increased in July, according to monthly data released by Spectrem Group.

The Chicago research company said last week that its Spectrem Millionaire Investor Index rose 4 points in July to negative-16. The advance, which keeps the index in mildly bearish territory, comes after an 18-point decline in June, which represented the largest one-month decline since the index's inception in February 2004.

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