Relationships naturally form when people have common activities and goals. That is part of it but I don't think it is all of it. Relationships form when people

Relationships naturally form when people have common activities and goals. That is part of it but I don't think it is all of it. Relationships form when people share membership in something like a "community", a larger group of people sharing common approach of "looking out for each other", of engaging in basic acceptance of each, common language, history and "values", to various extents. This isn't saying that a relationship can't form between people not sharing a community but to an extent, such relationships have to expand to create the things that community naturally provides (making just "common interest" relationships a little fragile). I mean, human beings began having relationships in terms of small bands deeply sharing an entire culture. The more developed human societies made those sorts of relationship more flexible but still fall what I'd vague call "deep commonality" but form such commonality in a "market place" is extremely difficult each person is going to feel a lack of the basic loyalty that "deep commonality" implied.