Presented at a conference on Expert Advice and Public Choice. Knowledge as a commodity and knowledge as power combine in an industry developed to provide knowledge to policymakers. This "industry" is of interest because it is large, it can contribute to better decisions, and it may exercise inappropriate influence on public decisions. The author describes a model of government decisionmaking in which important decisions are the result of a deliberative, ongoing, adversarial process. Arguments provided by the industry as input may be characterized by their timeliness, technical respectability, sensitivity to policy and political concerns, and vulnerability to charges of bias. The author urges that legitimate concern should focus on the character, structure, and openness of policy debate. 35 pp. Ref.