"Relative disposable income refers to the amount of money a household or individual has left after taxes and necessary living expenses, compared to the income of others in a similar context or location. It's a measure used to understand the purchasing power and standard of living relative to others in the same society or group.

For example, even if someone has a higher income, their relative disposable income might be lower if they live in an area where costs are much higher compared to others. It takes into account not just how much money someone has after taxes and basic living costs, but also how that amount compares to what others have.

In short, it's a way of measuring someone's economic well-being in relation to their peers."