The line chart illustrates/depicts the average monthly expenditure of 3 different classes of families in the USA in 5 periods between 2000 and 2020.
Overall, we can see that all family groups started at different levels. Additionally, while the low- and high-income family classes both consistently increased, the middle-income group experienced a one-time drop.
In detail, during the first period, high-, medium- and low-income families started at exactly 600$, 400$ and 200$ of monthly expenses, respectively. After 5 years, the high-income family group had its biggest increase of almost 100$. It continued to rise until it reached 700$ in 2010 where it remained the same for the next 5 years before slightly increasing again until 2020.
In terms of middle-income group, it rose to 450$ for the next decade, however, in 2015, it experienced a sudden drop to its original amount before rising again up to 500$ in the last period. Lastly, the low-income families had the highest increase among 3 categories, for about 10 years, it only went up for 100$, but from then on, it skyrocketed within 5 years to reach double of its starting level and in the last period, it continued to rise to 450$.