Excerpt:
Given the growing income inequality in the United States, the relationship between wealth and compassion has important implications. Those who hold most of the power in this country, political and otherwise, tend to come from privileged backgrounds. If social class influences how much we care about others, then the most powerful among us may be the least likely to make decisions that help the needy and the poor. They may also be the most likely to engage in unethical behavior. Keltner and Piff recently speculated in the New York Times about how their research helps explain why Goldman Sachs and other high-powered financial corporations are breeding grounds for greedy behavior. Although greed is a universal human emotion, it may have the strongest pull over those of who already have the most.
Full article: How Wealth Reduces Compassion: Scientific American.