My take on this is that if global economy is going to collapse, then there's no way prices will increase linearly,...the thing will be exponential. Nobody is in a safe spot, not even with some whole coins in the pocket.

In our western world, real wealth is disappearing, because farmers are disappearing, butchers are disappearing. Anything linked to basic needs is externalized to supermarkets. If global economy collapse, who is going to fill supermarkets' shelves? Nobody. People will have to figure stuff out and there are a limited number of farmers willing to sell their eggs, chicken or beaf. In that scenario, no amount of bitcoin will save you from despair, and if the game turns to be a matter of "who offers more takes the good" then it's pretty obvious how quick tens of coins can be spent.