Time is always scarce.

In the next 100 years, we will find that food is scarce.
Gold will not buy food, but if you grow food, food will be given to you in times of need.

Anyway, money is a concept, a way to preserve your calories spent now, into calories in the future.
It is not very good. It really only works in areas of relative abundance.

When looking at a pure, clean running stream, how much is a glass of water worth?
You have been out in a desert for a day, dying of thirst, how much is a glass of water worth?

But really, we do not need money, what we need is an accounting of energy expended balances.
We could create a computer-aided bartering system.

But what is really necessary is a balancing of energy system.
If you give too much, you will drain yourself, and develop resentment... and so, the future, best system will account for energy balances. And balance really is that important.