If you have $1000 and no one else has money to buy goods the prices drop and your $1000 worth much more.
Depends on the goods and the chance to replace it. Example you are half way across the desert you are out of water so you offer a traveling companion a $1000.00 for his lone canteen of water, do you think he would sale even at that price?
I think having cash is important, but I would rather have barter-able goods such as canned food, bottled water, ammo, alcohol, medical supplies, and high demand everyday common items such as TP.
He who has excess TP will become a VIP in the coming apocalypse. :-)