Kazakhstan Tenge Slides 23% as Emerging-Market Rout Strains Pegs

Emerging Currencies Fallout Seen Posing a Risk to Bonds

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Kazakhstan relinquished control of its exchange rate in the latest sign emerging nations will stop defending their currencies after China roiled global markets by devaluing the yuan.

The central Asian nation, which counts Russia and China as its top trading partners, said it was switching to a free float, triggering a 23 percent slide in the tenge to a record 257.21 per dollar. Since the shock yuan devaluation last week, a gauge of 20 developing-nation exchange rates capped its longest slump since 2000, Vietnam devalued the dong and currencies from Russia to Turkey and Malaysia slid at least 4.6 percent.