The idea that a little inflation is better than none comes from the thought that money should be changing hands as much as possible, and if money kept its value people would be incentivized to save all their money and keep it to themselves, and that would remove it from the economy. But if the value of that cash goes away people will want to invest it in something that might not lose its value, like a service.

Idk that’s just the way it’s always been explained around me I’m not some money jockey