Yi, who heads the State Administration of Foreign Exchange, said he’s concerned about the potential fallout from expanded asset-purchases programs and near-zero in the world’s advanced economies.

“Quantitative easing for developed economies is generating some uncertainties in financial markets in terms of capital flows,” Yi, who is also head of China’s foreign-exchange regulator, told reporters. “Competitive devaluation is one aspect of it. If everyone is doing super QE, which currency will depreciate?”

Japanese Economy Minister Akira Amari said in Davos that his nation is trying to defeat deflation rather than weaken the yen, after Prime Minister Shinzo Abe’s push for laxer monetary policy sparked a slide in the currency. His comments on Jan. 26 followed a week in which German and Canadian policy makers joined a worldwide chorus highlighting a recent plunge in the yen as a worry.

“A currency war, a series of tit-for-tat competitive devaluations, would trigger trade protection measures that would damage global trade and therefore growth globally,” said Louis Kuijs, chief China economist at Royal Bank of Scotland Plc in Hong Kong, who previously worked for the World Bank. “That would not be good for any country with a stake in the global economy.”