The economic impacts of telecom services are measurable on a broader scale. The economic growth for several countries and regions within the hubs of end users and innovation (USA, Canada, Australia, Scandinavian countries, etc.) found

that relationship is real but its effect varying from one another.

Example - Broad band diffusion

http://www.digiworld.org/fic/revue_telech/918/UBB_GENTZO_ARAVAN.pdf

The subject is so broad and diverse (I suppose you would need to somehow narrow it down) that the sources would be plentiful. Perhaps this compilation may be good to begin with:

http://www.amazon.com/Handbook-Telecommunications-Management-2-Volumes-E-Business/dp/1605661945/ref=sr_1_2?ie=UTF8&qid=1441488760&sr=8-2

Thank you both for your answers.

I kindly ask you to send me articles or white papers, if you find anything interesting.

Best regards.

Igor