system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Will a single global currency ever be possible?
gpt
Possible? Yes
Likely? No.

A global currency means every government in the world would have to follow strict fiscal policies, they couldn't manipulate exchange rates to help their industries, couldn't spend more then their tax revenues. The lessons learned from the Euro make it very unlikely we'll see a global currency.