The departure of the United Arab Emirates from OPEC is the largest blow in its history, losing its third most important partner.
The UAE, which produces 4.5% of the world's crude and 13% of OPEC's, had disagreements with the organization before the Iran war.
The UAE has a more diversified economy than Saudi Arabia and does not need to maintain high prices to balance its accounts.
The UAE chose to leave OPEC in order to be able to produce more crude.
The recent increase in US oil exports has threatened OPEC's dominance.
The weakening of OPEC favours Donald Trump in his attempt to consolidate the US as the main crude exporter.
Conclusion: The departure of the United Arab Emirates from OPEC marks a significant change in the structure of the oil market and could favour the United States, although the long-term implications are unclear.