We could find out how selfish people are to help people

People are not only self-interested, there are other relative preferences, including social preferences, which have been approved by many economic researches. Charitable giving is one prominent example, suggesting people do care about others in need. Andreoni (2006) suggests most giving is made by individuals. The paper also shows that giving behavior is constant. However, the paper could not fully explain how much people care about others in need, because charitable giving could have other incentives, such as showing off. Therefore, we could compare anonymous charitable giving by ordinary charitable giving. However, by making such comparison, we do not find how much people care about others in need, instead we find how much charitable giving is influenced by using real names. There are always other self-interesting incentives affecting charitable giving, it is impossible to eliminate all; however, we can find out each individual self-interesting incentives affecting charitable giving that we can list and draw a conclusion about how much charitable giving is influenced by the main self-centred incentives. Maybe we do not find out how selfish people are but we can use these incentives to increase charitable giving and help more people in need.