Thought experiment:

In your household you all exchange goods for stones.

There are 100 white stones, and 100 red stones.

1 new white stone is added to the economy per year

The red stone supply is doubled every year.

Which stone will you hold your wealth in?

Will you try to 'time the top'? Selling red stones for white - even only temporarily?

If you had any red stones, what would you immediately do with them?

So then why do you hold a single dollars worth of fiat?