Which points out that income inequality is not useful on an absolute scale. In other words if you make 1M a year and your neighbor makes 2M a year your lifestyles are very similar. However, if you make 10$/day and your neighbor makes 20$/day your lifestyle can be very different.
Just because a number is useless on its own does not mean that it's useless in all circumstances. Generally, we know both inequality and average income.
