Slumps in the ruble, yuan, and Argentine peso underscore how the US dollar is a more reliable currency, an expert told Insider. In the past week alone, the Chinese yuan, Russian ruble, and the Argentine peso plunged, forcing the countries' central banks to take drastic measures to calm markets. The Chinese currency fell Thursday to its weakest level this year amid investor anxiety over the deepening slowdown in the world's second-largest economy. Last month, Russian president Vladimir Putin said more than 80% of his country's trade with China is settled in the yuan and ruble. "The recent decline and volatility in the Chinese Yuan, the Russian Ruble, and to a lesser extent the Argentine Peso, will only add further challenges to the idea of de-dollarization," Zain Vawda, market analyst at DailyFX, said.

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