Or just look at the unemployment statistics. https://www.statista.com/statistics/268830/unemployment-rate... The countries outside of northern Europe that are on the Euro or pegged to it have much higher jobless rates than those with their own currency. Czechia, Romania, Poland, Hungary are not pegged while Bulgaria, Lithuania, Estonia are. Similarly outside the EU, Bosnia is pegged and doing poorly, Iceland is not and doing fine even though they were very hard hit by financial crisis.
It's exactly analogous to the way the fixed gold exchange rate was deflationary during the Great Depression and as soon as countries dropped the gold standard they started recovering.