I. Public Intervention in the Economy. Economic Administrative Law. Concept. Public authorities' intervention in the economy: origin and evolution. The regulatory and social state in economic administrative law. II. The Impact of European Policies on Spanish Economic Regulation. III. The Economic Constitution and Its Main Components. Concept. Freedom of enterprise. IV. The Coexistence of Public and Private Economic Activity. The public economic sector. The reservation of essential resources or services to the public sector: services of general economic interest and non-economic services of general interest. The new liberalized context in which the Services Directive, the circular economy, and the collaborative economy are developing. V. The Principle of Free Competition. Concept. Practices aimed at distorting competition, with special attention to abuse of dominant market position. Authorities responsible for defending competition and the measures they may adopt. VI. Decentralization and Economic Administration: The Principle of Market Unity. VII. Economic Planning. General economic planning and sectoral planning as forms of activity linked to the economy. The General State Budget Law. The constitutional principle of budgetary stability. VIII. Regulated Economic Sectors. The banking and credit system. Insurance. Agriculture. Industry. Domestic and foreign trade. Transportation. Energy. Telecommunications. Media.