Bloomberg: The oil market just hit a yellow light.
Crudes advance of more than 90 percent from a 12-year low earlier this year has U.S. shale producers starting to return to their drilling rigs, threatening to slow further gains.
"The $50-to-$60 a barrel area is the sweet spot," said Mark Watkins, the Park City, Utah-based regional investment manager for The Private Client Group of U.S. Bank, which oversees $128 billion of assets. "You start to have producers come back at $50, but a lot of them come...