OPEC Oil-Output Cuts Aided by Exempt Nations as Compliance Slips

OPEC’s progress in reducing the oversupply in global oil markets relied on contributions from Nigeria and Libya in March, two countries that are exempt from the group’s deal to rein in production.

OPEC and Allies Said to Improve Compliance With Oil-Output Cuts

OPEC and its allies improved their collective compliance with a supply-cuts agreement last month as deeper reductions from members of the group offset weaker implementation from other producers.