The article explores how trust affects behavior in a game where one person lends money to another. The researchers conducted an experiment outside the lab and found that when people cooperate, they are more likely to trust each other. On the other hand, when people compete, they tend to be suspicious and untrustworthy. This shows that trust is a key factor in economic transactions and can influence how people interact with each other. The study used social network analysis to understand how trust and reciprocity play out in these situations.