But to answer your question more directly, you should use a money that loses value because its purpose is as a medium of exchange and not a store of value. You need to have something in your life that you can reliably use to acquire things you need and exchange them for things you have (new laptop for hours worked). You want a hot potato, you get it, you pass it along to someone else. If you don't want to spend it on material goods and want to save, that's fine, you can instead "buy" a savings, or "buy" an index fund. You're still passing the hot potato around, but its giving you different things.
Now imagine you don't have a hot potato, you work and you get paid in... idk, something you don't want to get rid of. You struggle with letting go with your currency and so it costs you when you're trying to do exchanges. Similarly, if you're a shop owner or something, people are more hesitant to give you their currency as well. Things get slower, and darker, like a mechanical flashlight that you're spinning slower and slower.