“They live in the same world for the first half of 2018, but divorce into separate universes for the second half,” said Olivier Jakob, managing director at consultants Petromatrix GmbH in Zug, Switzerland. “OPEC believes in strong growth of oil demand; the IEA believes in strong growth of non-OPEC supplies.”

Link to the article: https://www.bloomberg.com/news/articles/2017-12-15/oil-in-2018-is-a-duel-between-visions-of-opec-victory-or-defeat