Let us say that you purchase real certified physical gold at $1250 an ounce.
1) tell nobody or somebody will show up and steal it.
2) Don't try to buy anything with it because nobody can verify its purity and anybody willing to take gold as payment knows they too will have a hard way of spending it, and so the terms anybody will accept gold as payment will stink.
3) As commodities devalue, the paper currency traditionally increases, thereby increased the actual purchasing power of the currency. Why? Because people want cash, not heavy stuff that hurts if they drop it on their foot.
4) if commodes devalue in a deflationary cycle, then gold devalues and you ride that descending slope downward.
5) Thus gold is not a hedge in a deflationary cycle.
6) If cash runs out, you're broke, just as you would be at any other time cash ran out. Why? Because cash (or any currency) is packaged power that can be deployed, held in reserve, lent and stockpiled for a rainy day.
I don't believe that is what happened in Argentina when there economy collapsed.