The Borsa Istanbul 100 Index may be poised to retreat as much as 18 percent in the next six months, if history is a guide. The gauge’s 50-day moving average neared 278 points of crossing its 200-day measure on Monday as stocks plunged 7.1 percent following the failed coup attempt over the weekend. The move below the average is a pattern that’s happened four times since 2008, each time preceding a drop of about a fifth.

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