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When you can go into what was Walmart, or Amazon online, and get what you need for free why would you bother with barter?
You can, of course do as you please, this is a voluntary paradigm, but why would you reenslave yourself? That doesn't make sense.
It takes a tiny fraction of the people to keep our consumer goods flowing, even today, that won't change when everything is free because those that contribute nothing today will become productive, or be outed as bums.
Under my proposal bums are equal with ticks and mosquitoes, not many will mourn their demise.

how would you go into a store & get those things free? please explain because this sounds like the kind of utopian assumptions RBE/zeitgeist movement supporters suggest as a solution but they entirely ignore reality & questions such as how to solve the price calculation problem

voluntary trading things isnt slavery, slavery is being forced to obey someone against your will

We don't need the price calculation, we only reorder what is taken from the shelf.
If you can't get folks to take your products for free you are going to need to find a new line of work.
When you do your checkout at the store the computer algorithm knows to reorder what you have taken.
Most things will be ordered from the internet and delivered to your door.
Eventually local producers will cut long distribution lines.
I know it will be hard for you to imagine the world without an accounting department and an oligarch over that to satisfy your need to be controlled, but the reality is that next Tuesday the workers could just keep working, but stop paying, and EVERYTHING is free.