The line graph illustrates the average price of monthly plans from four cell phone providers in a European countries in the first three quarters of 2002.
Overall, there was an increase in the figures for all companies, except for Sim TX whose price remained unchanged over the period shown. In addition, the monthly cost of Alpha’s contract experienced the most remarkable growth.
To begin with, Alpha originally offered the lowest price in beginning of 2002 at only 5 euro per month. The price remained relatively stable during the next 5 months before a surge to 25 euros in September, which made Alpha the most expensive providor examined. Meanwhile, Domo’s users had to pay the highest price for the majority of 2002 as the price rose gradually from January to July, followed by a slight decrease to about 23 euros by September. Similarly, there was gradual growth in the price of Lex’s contract, from approximately 12 euros in January to 17 euros in September. In contrast, after peaking at 14 euros in June, the average cost of Sim TX decreased and returned to its original price of 8 euros.