StumbleUpon Capitalizing on Mobile Migration: CEO

Sept. 18 (Bloomberg) -- StumbleUpon CEO Mark Bartels discusses the company's business model and growth prospects with Emily Chang on Bloomberg Television's "Bloomberg West." (Source: Bloomberg)
How Does OPEC Today Differ From the 1980s?
34:25 - Bloomberg Intelligence's Vincent Piazza reports on OPEC and the price of oil. He speaks on "Bloomberg Surveillance." (Source: Bloomberg)
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