The line graph illustrates the fluctuations in the monthly contract costs of four cellular companies—Domo, Lex, Sim TX, and Alpha—in a European country between January and September 2012, with prices measured in euros.
Overall, the most notable trends include a consistent rise in prices for both Domo and Lex, while Sim TX experienced a steady decline. Alpha, in contrast, had the most dramatic shift, beginning as the cheapest service but ending as the most expensive by September.
Domo had the highest prices at the start, with contracts costing 15 euros in January. This price fluctuated moderately, peaking at 25 euros in July before dropping slightly to 23 euros by September. Similarly, Lex began at 12 euros, experienced a steady increase throughout the period, and reached 19 euros in September, mirroring Domo’s upward trajectory.
In contrast, Sim TX followed a declining trend, starting at 10 euros in January and gradually decreasing to approximately 7 euros by September. Alpha exhibited the most significant shift, beginning as the cheapest option at 5 euros in January, but surging rapidly after July to surpass all competitors, ending at around 30 euros in September.