Services can be exchanged without money and interchangeably between goods as well.
I do this regularly. I rebuilt someone's Windows machine the other day in exchange for the fruit trees in my garden being pruned.
I do this regularly. I rebuilt someone's Windows machine the other day in exchange for the fruit trees in my garden being pruned.
If you will, money is a message is a message passing protocol. I don't care what's on the other side and how the message (money) was generated - all I care is that I received a message (money) and then I sent other messages (money) to other actors in the network (obviously I sent back something in exchange and so do the other nodes). Then they generated their messages and so on. This way all I need to know are the nodes immediate to me to work it out. I don't care how complex the message graph becomes, it's all irrelevant to me and to others as well. If you don't have that then you have to broadcast all that you offer and all that you need and somehow create the graph to work it out all out. Money is a cheap way of abstracting all that.
Capitalism is primarily about generating profit, and there's no profit without money.
It all went downhill after the Enclosure Acts.
The lack of money involved just makes it potentially less efficient if the trade isn't well balanced, or potentially more efficient if they can avoid the friction of the taxman by avoiding money.