system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What would happen if no-one in the entire world spent any money for a day?
gpt
I don't think anything at all would happen.

People would just spend that amount the next day.  People still need the things that money buys.  A few small companies might have trouble making payroll if they run things super tight but it really wouldn't change anything.