NEW YORK (AdAge.com) — Multiple reports have Google buying Groupon for $2.5 billion and change. But why would Google want an email-based startup in the first place? To get at the nearly $14 billion U.S. local online ad purse, that’s why. Especially because small and medium businesses are expected to spend 10% less on Google’s core paid search in the next five years, according to Borrell Associates.

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