This paper addresses issues related to the regulation of the delivery of mental health services. The focus is primarily on regulations that are aimed at dealing with the consequences of imperfect information in the marketplace. The paper reviews and assesses what is known about the impact of regulations on efficiency and equity. One conclusion is that we know a fair amount about impacts of regulation on prices for mental health service and very little about effects on quality of care. A research agenda is proposed based on the knowledge available in 1988.