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The line graph gives data about changes in fees of deal with 4 different cellular companies for a month between January and September in 2012. (measurement is done in euros).
In general, all companies’ contracts saw a rise in cost except the rate of Sim TX having the same initial and eventual numbers. Meantime, Alpha had the most significant growth surpassing remaining 3 agencies.
To begin with, the contract with Sim TX costed around 8 euros(second-most affordable price) in January, then it went up to a peak of 15 euros after 6 months. But, despite it in September customers could buy tariffs in the same price as in January. As for Alpha, its dealing fee stood at 5 euros (the cheapest alternative) in the first half of a year. However, this rate rose by 20 euros over months, showing the highest number.
On the other hand, Domo and Lex presented striking similarities. In other words, having a gulf of approximately 3 euros between each other, both experienced an increase in cost of contract (from 15 euros to around 22 euros and from 14 euros to 19 euros respectively).