If there are only 2 coins in the world and they are valued at 100.00 and nobody sells for fiat at a cheaper price, there is no volatility.
If I can spend my 100.00 coin anywhere, then why would I sell it for a cheaper price? I can't paint the picture any clearer.
You're painting your own picture, how you see the world. It doesn't mean that your picture is a real world.
I am just stating at an elementary level full understanding of what you say isn't true.
In imaginary worlds anything can be true.
