The first generation of mobile phones was introduced by Motorola 45 years ago.

What has happened in those 45 years? Currently, the number of people using mobile phones is higher or lower? In other words, has the use of mobile phones become popular or not? In general, are mobile phones more expensive or cheaper? Why? What are the reasons that have affected the use of mobile phones? What factors largely determine the production costs of mobile phones? Attention please,

In your essay, remember to answer all questions based on information from reliable sources, and Present or refer to the scenario (graphic) of the supply and demand model that best illustrates each of your arguments. For example, if you state that "technological progress has led to a decrease in costs and, therefore, increased the supply of mobile phones", you must present or indicate (a) which of the scenarios (graphs) of the supply and demand model best illustrates an increase in supply and (b) you should also add what the impact of an increase in supply is on prices and quantities consumed. See the document on supply and demand charts for reference.