The global business consultant McKinsey & Co. has agreed to pay nearly $600 million for its role in the opioid crisis. In a deal announced Thursday with attorneys general for most states, the company agrees to make public documents showing communications with OxyContin maker Purdue Pharma and three other companies that have been in the opioid business. The settlement is novel because McKinsey did not make or sell the powerful painkillers but rather advised companies that did on how to boost their business. States say the company encouraged Purdue to focus on selling higher doses and high-volume prescribers.