Just weeks ago, Straight Path Communications was an obscure telecommunications company with a $400 million market capitalization. Today, it has a equity valuation of about $3 billion, and it's only climbing higher. What happened? A bidding war between AT&T and Verizon, according to people familiar with the matter. Bloomberg Gadfly columnist Tara Lachapelle and Bloomberg wireless reporter Scott Moritz explain why Verizon is forcing AT&T to pay top dollar for a little-known owner of wireless licenses and airwaves.

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