Yes, that is indeed the "conventional wisdome," but Ferfal makes the case very strongly that "barter markets," which were tried and tried hard, just didn't work.
So the "barter markets" went to printed "market value coupons" in lieu of Argentine Pesos. (There was a severe limit on peso withdrawals, even after the banks were reopened.) But the "market coupons" were too easy to counterfeit on home computers, so that plan also proved unworkable.
In the end, even devalued (4::1) paper pesos proved more in demand.
Using 22 Long Rifle bullets as "currency" sounds great, but it's not currency. It's bullets. The guy who has the eggs you want might already have plenty of ammo. He wants gasoline, which you don't have. Etc, etc, etc.
Not only that, but post-crisis, expect your govt to outlaw the sale without permission of ammunition. So then you must worry about selling your ammo to some ATF "narc" and getting busted.
Yes, the govt will be strapped and stretched, but it won't disappear. It might not be effective enough to save you in a crisis, but it will come around later to arrest you, for example, for shooting that "looter" on your property.
I seriously recommend reading his book. Much of what we consider "conventional wisdom" was proven to be a fantasy by the events in Argentina when their economy collapsed, the banks were closed and the stores and markets were all looted to the walls.
The one type of bartering that I can see becoming more and more of a reality is the bartering of services.
“I’ll fix that plumbing problem for you in exchange for three months piano lessons for my kids.”
That sort of thing. I’ve seen this already happening more and more in businesses related to construction. For that reason alone it would be wise to learn and develop as many of these practical skills as possible now in order to have something of value to trade in the future.