I disagree with the OP big time. A single currency has benefits (ease of transactions across the globe, elimination of currency risk, etc) but it also has signi

I disagree with the OP big time. A single currency has benefits (ease of transactions across the globe, elimination of currency risk, etc) but it also has significant downsides, as we saw during the 2007+ financial crisis where countries like Greece couldn’t use monetary policy to help reduce the burden their economies were facing. But saying that we should switch to a global currency does not mean one thinks different national currencies are the same. In fact, it very much implies the opposite, because then you already essentially have a global currency in all but name.