There was an experiment where kids with a more stable fiat currency and kids with very inflationary fiat currency went through the marshmallow test and there was a clear difference.
If you're unfamiliar with the marshmallow test: a kid is given a marshmallow and told not to eat it. The person who gave the child the marshmallow leaves and promises to come back 5 minutes later with another marshmallow that the kid can have if the first marshmallow remains uneaten.
Kids with very inflationary currency tend to not wait the 5 minutes.