The US is all about numbers, big, big numbers. It has a mobile population exceeding 300 million, and a mobile internet user base on the verge of surpassing 100 million.
With this level of scale, mobile advertising budgets are high – especially in relation to Europe – with the average mobile advertising campaign in the US between $75,000-100,000.
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http://www.associationofmarketing.org/whitepapers/view.php?whitepaper_id=101