Public or private organisations that secure health insurance coverage for the workers of all member employers. The goal of these organisations is to consolidate purchasing responsibilities to obtain greater bargaining clout with health insurers, plans and providers, to reduce the administrative costs of buying, selling and managing insurance policies. Private cooperatives are usually voluntary associations of employers in a similar geographic region who band together to purchase insurance for their employees. Public cooperatives are established by state governments to purchase insurance for public employees, Medicaid beneficiaries, and other designated populations. See Purchasing Alliances.