Bob Tippee Editor Days before an unusually interesting meeting of the Organization of Petroleum Exporting Countries, a reminder is in order. OPEC does not produce oil. Not a drop. It therefore will not respond in any physical way to global calls to produce more oil. It can’t. OPEC sets production limits for members other than Iraq, the sum of which is what everyone knows as the OPEC quota. At its ministerial meeting June 8 in Vienna, OPEC will decide whether to adjust members’ production limits so as to lift the aggregate quota. The decision will say much about OPEC’s reading of the market and intentions for price. The central question, though, is how much crude oil OPEC...