(Bloomberg) -- Price swings in emerging-market stocks widened to the most in four years and currencies slid to a record in a sign the Federal Reserve’s decision to delay an interest-rate increase is leaving investors more nervous instead of calming them.

Thirty-day volatility in the MSCI Emerging Markets Index has risen on three of the five days since the Fed’s move on Sept. 17, pushing the equities benchmark toward the second- biggest weekly slump since May 2012. The gauge fell for a fourth day, the longest streak in a month, as investors awaited a speech by Fed Chair Janet Yellen for clues on U.S. monetary policy. The currencies of South Africa, Turkey and Malaysia -- countries identified by markets as deserving a credit-rating downgrade -- declined.

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