On 21 November, at the end of the first shift at the Tyson Foods beef processing plant in Lexington, Nebraska, all workers were called to the lunchroom and told they no longer had jobs.. And the move didn’t seem to make sense. Tyson is one of four beef producers – along with JBS, Cargill and National Beef, known collectively as “the Big Four” – that control 85% of the industry, and their profit margins are at their highest levels in years as consumer prices soar. Tyson had just announced that its profits were up 6.5% over the previous year. Why...