GM-Peugeot Discussion Said to Slow While Economy Worsens

General Motors Co. and PSA Peugeot Citroen’s efforts to deepen their alliance have slowed recently amid a worsening European auto market and complicated regulatory review, people familiar with the matter said.

The companies have already missed a June 30 deadline on the parts-buying plan. The automakers also aimed to announce as soon as this week at the Paris Motor Show more details on plans to jointly build four model lines using common underpinnings and to combine purchasing efforts, said the people, who asked not to be identified discussing internal negotiations.