The State Street Investor Confidence Index fell 2.4 points this month from August, to 70.7, the third-lowest level in its history, according to State Street Global Markets.

Confidence among North American investors remained "subdued," rising just 0.9 points, to 76.1, the investment research and trading arm of State Street Corp. said Tuesday. Confidence among Asian investors fell 2.5 points, from 88.3.

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