Affluent investors' confidence increased last month for the second consecutive month, according to Spectrem Group.

The Chicago research company said Wednesday that its Spectrem Affluent Investor Index, which measures the investment outlook of households with $500,000 or more in investable assets, increased 9 points, to negative-21, remaining in mildly bearish territory. It rose 8 points in March. The index is at its highest level since August 2008, when it stood at negative-13.

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