Answer:
Two families having the same economic source and earning the same amount may have different quality of life for the following reasons
1. Prior Commitments- A family may have ongoing bank and personal loans which
have to be repaid.
2. Different Priorities- A family may have separate priorities. They may save more than they spend. They may invest the money somewhere else.
3. Distinctive requirements- Health conditions and education are pressing situations and a family may have this condition where the greater amount is saved for supporting the education of their children or for medical reasons.