

I’m not sure if “strongest currency” is a good wording here because the absolute exchange rate has nothing to do with how strong a currency is. It’s the relative exchange rate (what was the exchange rate last year and what is it know) that would be a better fit to gauge how “strong” a currency is.
Approval voting and more parties could theoretically improve things quite a bit. But switching to approval voting is probably not simple because why should the biggest parties support something that hurts them.