FORTUNE -- The floodgates officially opened on Thursday Oct. 15, 2009. That's when Apple (AAPL) sent a letter to iPhone developers telling them they could adopt a new business model: Give away their apps and make their money selling extras -- new...
Apple’s controversial cash cow: Free apps that sell extras
In-app purchases set records in February: 76% of U.S. App Store revenue, 90% in Asia.
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