The crude oil market is curious as to whether the cartel and those non-OPEC producers who took part in the deal will honour their agreement or whether cracks will start to appear. I would be very surprised if producer nations breached their agreed quotas by noticeable margins because while that might be profitable in the short-term, it could be very costly in the long-term. Why sell more oil for less when there is a chance to sell less oil for more in the future?