McKinsey & Co., a leading global consulting firm, has agreed to pay $78 million to settle claims from health insurers and benefit plans that it helped fuel the opioid addiction crisis in the United States. The plaintiffs accused McKinsey of helping drug manufacturers design deceptive marketing plans and boost sales of painkillers. The settlement is the last in a series of settlements McKinsey has reached and is hoped to bring some closure to the families and communities affected by the crisis.