Professor Zhang: Benefits are not just material benefits  We should put credit, reputation, affection and even some preferences into the category of benefits
According to this broad understanding of interests, if each individual satisfies his own interests as far as possible without harming the interests of others, then the society composed of these individuals is a good society
If a society is not good, then there must be cases in which individuals harm the interests of others or their own interests are not satisfied as far as possible, which will harm the overall interests of the society.