This year will be the first when in-app sales exceed mobile app advertising, pointing to a growing revenue stream for developers, Yahoo has projected. Last year, $21 billion was spent on in-app purchases of content, and $23 billion on ads; in 2015, $33 billion will be spent within or on apps, and $31 billion will be spent on mobile ads, the company estimated.
"The mobile app consumer has been trained to pay for content. It's not like the Internet. That is phenomenal news," Khalaf said.
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