Pump jacks are seen on the Bakken Shale Formation, near Williston, North Dakota, on September 6, 2016. / AFP / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

Amid all the speculation about what the tentative OPEC agreement to limit its production does and does not mean, one factor that analysts and the markets tend to forget about is how the world’s new swing producer – U.S. shale producers – will react. Because the inconvenient truth here is that these shale producers, while not a “cartel” in name or in practice, are the only variable in the

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