How much money do these paid apps on smartphones such as iPhone and others bring? A study by eMarketers shows a terrific potential for growth over the next 3-4 years. Here are the revenues estimated to come from the American smartphone paid apps market.

2009 : $343 million
2013 : $4,200 million

This is not entirely convincing since Apple App Store alone is estimated to be making around $560 million to $1 billion to the app developers currently.

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