As far as I can follow his reasoning the conditions can theoretically exist, but human nature will always sabotage them from functioning as intended. If we were neighbours and either of us had a surplus of something, would we try to undercut the others askingprice at market? Or would we co-operate and try to edge out the people from the other villages at said market? Also, if you had something you no longer needed (say a pile of planks from an old shed) wouldn't you give those to a neighbour if asked, since you were going to toss or burn them any way? It's human nature. Some of us are like that, that we will first ask around to see if they can help someone else, free of charge, since helping wouldn't cost them any anyhow. Others are like the mother of a childhood friend, who would always ensure that anything she threw out was smashed, cut up andbroken so no-one else could use it, no matter if it was an old sofa or a t-shirt.