Millionaires became slightly more optimistic about the future of the U.S. economy in May, according to Spectrem's Millionaire Investor Index.

The index, which measures the investment outlook of households with $1 million or more in investable assets, rose five points to -9 last month, pulling it out of mildly bearish territory and into more neutral ground. The index hit a record low of -14 in April and June of this year; it is now at its third lowest level ever.

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