Check out David Graeber’s book Debt - The First 5000 Years. He argues that waaay before money people lived in complex credit economies, and that money only happened when there was war, so that you could pay soldiers.

Also barter economies only happen when people who have been used to money don’t have access to money anymore. Didn’t happen before money, or at least there’s no evidence of it.

Depends on what stage its at. If you were to somehow manage the shit show of surviving through the beginning times and actually establish a system that works and one not ran by cult leaders then a free trade system could look really nice. The other problem with this would be the more people involved the more there may be people that disagree with this system since no matter what everyone has different opinions on what they want even if its a fully functional system. I also fear that ultimately, just as it is today, we would still be full of problems that most likely stem from world leaders that have to much power and fuck it all up for the rest of us.

Remember when toilet paper disappeared from store shelves because a respiratory virus was making its way to everyone? Eventually people realized they had toilet paper, the factories kept producing it, and the shelves recovered and we all agreed that was stupid.

Now imagine nobody has a reason/reasonable way to make their own toilet paper, and whatever toilet paper is available is up for grabs.

Now imagine that with pretty much everything else.

Anarchy (good)

Im going to guess the same tribal warfare as always.

every single thing is free?

Not possible. Maybe you would have barter when there is no money anymore. But if you take away even that then it is like living on a lonely island. I am not sure if it could be called society anymore.

Barter or non-monetary terms of trade would emerge. Probably, if your economy was large enough to involve lots of one off interactions with strangers then some commodity would become de-facto money.