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The Ifo institute's closely-watched business climate index rose to 109 points in November from 108.2 points in October, Ifo said in a statement, surprising analysts polled by financial services firm Factset who had expected another dip to 108.1.
"The German economy remains unaffected by growing uncertainty worldwide," Ifo president Hans-Werner Sinn said in a statement.
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"Not even the Paris attacks had a negative impact on survey data."
For its survey, Ifo quizzes companies about their current business environment and the outlook for the next six months.
The sub-index measuring current business climbed to 113.4 points while the outlook sub-index rose for the third consecutive month to 104.7 points, it said.
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In the key manufacturing sector, the upbeat outlook reached the highest level since March, indicating that production "will be ramped up in the months ahead".
A sub-index for the automotive sector continued to rise despite the emissions scandal at Volkswagen, Ifo said.
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