GDP Per Capita vs Telecom Use.ppt (1386 KB)
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Not convinced that people spend more money on telecommunications as incomes increase? Skeptical that the introduction of mobile phones has democratized telecommunications? 

The World Bank offers some amazing data visualization technology, powered by Prognoz.  This ppt shows screen from a time series that plots real per capita GDP on the x-axis against telecom use (number of fixed line and mobile phone users per 100 people) on the y-axis.  Amazing to see the consistently linear relationship up until the early 2000s, when mobile phone use started to become cheaper and more ubiquitous.   

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