In the two years since Apple launched the iPad, the tablet market has exploded. When one includes Android and other tablets as well as e-readers, nearly 100 million tablets were sold in 2011.

Tablets and smartphones will not completely displace PCs. But they will quickly overwhelm them in terms of unit sales. When, where, how and to what degree this occurs will have tremendous implications across many businesses and industries.

In a report just out from BI Intelligence, we estimate that tablet sales will reach 400 million units by 2016, and lay out the key analysis behind these forecasts.

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Here are the four main considerations that will drive tablet growth in the next few years:

In full, the report:

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