Before Industrialization, people used live in small communities, with relatives spanning generations. Now that sort of thing does not exist anymore. Now people

Before Industrialization, people used live in small communities, with relatives spanning generations. Now that sort of thing does not exist anymore. Now people are abusing in the name of friendship: just use others, and don't reciprocate next time. This makes sense, if there are NO repetitive interactions, if looked from the perspective of Game theory.