The line graph illustrates the average annual expenditure of American consumers on cell phone services, national fixed-line services, and international fixed-line services over the period from 2001 to 2010.
Overall, there are distinct trends observed for each type of service, with cell phone services experiencing significant growth, whereas international fixed-line services exhibited a marked decline, while national fixed-line service spending remained relatively stable.
Focusing first on cell phone services, expenditure rose sharply from approximately $200 in 2001 to about $700 by 2010. This represents a substantial increase of $500 over the decade, indicating a growing reliance on mobile communication technology. The upward trajectory appears to be consistent throughout the entire period, showcasing a significant shift in consumer behavior towards mobile connectivity.
In contrast, international fixed-line services saw a notable decline in spending, starting from around $700 in 2001 and diminishing to $400 by 2010. This decrease of $300 highlights a decreasing preference for traditional international calling methods. Meanwhile, national fixed-line services exhibited relative stability, with expenditures starting at approximately $300 in 2001, experiencing a minor increase to $400 during the mid-decade years, before declining back down to around $300 by 2010. This suggests that while there was slight fluctuation, the overall spending did not significantly change over the specified years.