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Having food, ammo, first aid supplies, flashlights etc, handy and the most important thing here is that they are extra, and they are not your preps you will be relying on when SHTF or things get worse.
Items will become less available and having items stockpiles could work in your favor, and give you the things you need in order to survive.
Our friends over at backdoor survival have a pretty decent list with 40 items to have stockpiled ready for barter.
Bartering could mean the survival of your family, so please when thinking about what to stockpile, think it all through.