However, almost every community in the real world has some from of rules and some way of enforcing them. A community is a group of people who are united by a number of factors, including geography, language, and values that dictate acceptatle behavior. So why do we have rules, and what makes people follow them ? Studies have suggested that the reason we don’t like cheating and rule-breaking is because fairness is programmed into our brains. Tricomi et al ( 2010 ) have found that the brain reacts in a particular way when we fell we are being treated unfairly. The study identified a reaction in a specific part of the brain when test subjects were given less momey than others. A fair situation makes our brains respond in ways that lead to feelings of comfort and even happiness, but unfairness causes our brains to repond with negative felling such as anger and pain. The study found that this also happened when subjects saw other people being treated unfairly. They concluded that fairness is a basic human need along with bfood and social contact