I have not used them, I will have to have a look, thanks for the heads-up.

Here's a table that explains the Empathy breakdown of a Barter exchange.

b

I've just posted another note, 07 Title: Barter: Empathy and the Magic Wrapping that Money Cannot Buy. It's got a pretty good analogy in there, if I say so myself 😃 and you may find it interesting.