Beef packer margins improved for the third straight week, adding more than $100/head to profits on fresh record highs in the beef market. Margins are now around -$80/head, still very low by post-2010 standards but a sharp improvement from recent losses. The broad strength across beef markets — spanning all grades and primals — is an encouraging sign of pricing power and could help packer profits stay positive heading into the holiday season. Feedlot profit margins turned ...