An OPEC logo sits behind the reception desk at the OPEC Secretariat ahead of the 171st Organization of Petroleum Exporting Countries (OPEC) meeting in Vienna, Austria ( Photographer: Akos Stiller/Bloomberg)
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To contact the reporter on this story: Bret Okeson in Tokyo at bokeson@bloomberg.net
To contact the editor responsible for this story: Bruce Grant at bruceg@bloomberg.net