America's millionaires showed renewed confidence in the economy last month, according to an index released Wednesday by Spectrem Group, a Chicago consulting firm that specializes in the affluent and retirement markets.

Spectrem Millionaire Index showed that wealthy Americans were "mildly bullish" at the end of October, the company said. The October rebound was to an index reading of 14, from seven in September when the index fell to "neutral" for the first time this year.

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