The investor-owned corporation is the conventional form for structuring large-scale enterprise in market economies. But it is not the only one. Even in the United States, noncapitalist firms play a vital role in many sectors. Employee-owned firms have long been prominent in the service professions - law, accounting, investment banking, medicine - and are becoming increasingly important in other industries. Farmer-owned producer cooperativese dominate the market for most basic agricultural commodities. Consumer-owned utilities provide electricity to one out of eight households. Occupant-owned condominiums and cooperatives are rapidly displacing investor-owned rental housing. Mutual companies owned by their policy-holders sell half of all life insurance and a quarter of all property and liability insurance. And nonprofit firms, which have no owners at all, account for 90 percent of all nongovernmental schools and colleges, two-thirds of all hospitals, half of all daycare centers, and a quarter of all nursing homes. Henry Hansmann explores the reasons for this diverse pattern of ownership. He explains why different industries and different national economies exhibit different distributions of ownership forms. The key to the success of a particular form, he shows, depends on the balance between the costs of contracting in the market and the costs of ownership. And he examines how this balance is affected by history and by the legal and regulatory framework within which firms are organized.