The graph bellow illustrates the average monthly expenditures and comsumption of many classed of families in the USA from 2000 to 2010.
It is clear that the average monthly expenses of different families with low and high income levels had expected to the highest income in three income levels. In contrast, the middle income of families was a fluctuation in number of the monthly expenses of many different families in the USA.
In terms of high income, the average monthly expenses slightly increased from 600 to over 700 USD during the survey. In addition, families with low income had slightly growth monthly expenses for a decade, specificially from 200 USD to approximately 250 between 2000 to 2010 USD. Noticeably, families with low income had sharply growth (approximately 250 to over 400 USD) in the next decade. Furthermore, in the case of families with middle revenue, which had consistent trend for more than a decade, The amount of family monthly expenses slightly increased from 2000 to 2010, followed by a significant decrease to 450 USD in 2015, before rising again to 500 USD in 2020. Moreover, the meeting point of middle and low income in 2015. specifically 400 USD.