The article explores how people's income levels and different ways of presenting information can affect their willingness to cooperate in situations where the common good is at stake. The researchers found that wealthier individuals tend to contribute more than those with lower incomes, regardless of how the decision is framed. However, when the effects of contributions on final outcomes are highlighted, poorer individuals tend to contribute less. Overall, people's contributions are mainly influenced by self-interest, a sense of fairness, and past experiences with failed negotiations.