Normative theories describe how media systems should ideally operate based on certain values or principles. They originated from media practitioners, social critics, and academics. Early theories included radical libertarianism, which advocated no media regulation, and technocratic control theories, which supported government oversight. The marketplace of ideas theory proposed debating all ideas freely. Later, social responsibility theory emerged as a compromise, arguing media should serve the public interest through high standards and self-regulation. Current theories include dual responsibility models balancing social and financial responsibilities, and non-profit journalism funded by communities and donors. Normative theories vary based on countries' political systems and stages of development.