The Teamsters union has authorized a strike for over 18,000 Costco workers if a new contract is not reached by January 31. With 85% voting in favor, workers aim for better wages, retirement benefits, and leave policies, amid reports of Costco's record profits. The union accuses Costco of failing to negotiate constructively, raising concerns about operational disruptions and public sentiment towards the retailer. Negotiations are set to continue in the upcoming week before the expiration of the current contract.