The line chart illustrates the average monthly expenditure of three different family classes in the USA over the period of 20 years from 2000 to 2020.
Overall, we can see that all family groups started at different points. Additionally, while the high and low income family experienced an upward trend, the middle-income group showed a notable drop before rising again.
In detail, during the first period, the high, medium and low-income started at $600, $400 and $200, respectively. Over the next 5 years, the high-income group increased by roughly $100, then it continued to rise until it reached $700 in 2010. It remained stable at $700 from 2010 to 2015, then it slightly increased by $10 again in 2020.
In terms of middle-income group, it rose to $450 for the next decade, but it suddenly declined to its original amount. However, in the last period it strongly climbed to $500. Lastly, the low-income grew slowly to approximately $210 in 2010 before dramatically going up within 5 years and reached twice of its starting amount, then it continued to rise to $450 in 2020.