Nobody know squat about using gold/silver as real currency. It’s been culled from socioeconomic consciousness. Seriously: some guy offfers you a gold-colored coin for an alternator, do you know what it is? what it’s worth?
I strongly recommend Ferfal's book. One point he makes is that even the sheeple will get a fast education in the value of PMs after TSHTF! Overnight, "We Buy Gold!" signs will appear like mushrooms, after a peso (or dollar) collapse and bank closures. Then, even the sheeple figure out the value of gold mighty fast.
But there are many other valuable tips in the book. For example, a baggie full of old pawnshop wedding bands is more "useable" post-crisis than a one-ounce Krugerrand. You can pretend that each 14K gold band is your last item of value in the world...and trade it for food in the black markets that will spring up.
But if you pull out a one ounce Krugerrand, you are essentially flashing a thousand dollar bill, and you are announcing to all comers, "I'm rich! Kidnap me! Do a home invasion! Torture my family until I tell you where the rest are hidden!"
Trust me, this book is JAMMED with REAL info, not just the fantasies of "armchair survivalists."