Income inequality metrics measure how different people are in terms of their incomes. It looks at how people's incomes differ and can measure if some people have more money than others. For example, if Person A has an income of $100,000 and Person B has an income of $20,000, this would be seen as an example of income inequality because Person A has five times more money than Person B. Inequality metrics can tell us how unequal people’s incomes are and if some people have more money than others.