You are incorrect in the belief, that currencies of developed world do not fluctuate.
Pound sterling: http://www.macrotrends.net/2549/pound-dollar-exchange-rate-h...
Swiss franc: http://www.macrotrends.net/2558/us-dollar-swiss-franc-exchan...
Euro: http://www.macrotrends.net/2548/euro-dollar-exchange-rate-hi...
Yuan is much worse, though it doesn't matter that much due to capital control: http://www.macrotrends.net/2575/us-dollar-yuan-exchange-rate...