This article was recently published in German and English by “The Market” , a leading online Swiss financial journal. It argues that, in some respects, we have actually been engaged in a kind of currency war for many years. Countries are not actively trying to depreciate against the dollar, but they are actively trying to prevent their currencies from appreciating. Should the Trump administration now respond, be trying unilaterally to lower the value of the dollar, this could result in a decline in faith in the value of all fiat currencies. In short, another battle in the currency war would be a very bad idea.
https://themarket.ch/meinung/why-we-should-worry-about-a-new-global-currency-war-ld.1107