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South Africa’s rand is down, Turkey’s lira is up and China’s yuan and Malaysia’s ringgit are down for a fourth month in the last five.

The surveys by polling groups Merdeka Centre and Ilham Centre also showed strong concerns among voters over economic issues such as rising prices, slowing growth, and a weakening ringgit.

Worries over economic growth will begin to mount over the coming months, with a weaker ringgit also a drag.

The ringgit was one of Asia's worst-performing currencies in the first half of the year, losing almost 6% of its value against the dollar.

The ringgit , which has lagged regional peers in Southeast Asia, is trading near a 7-month low.