This book explores current issues regarding the regulation of various economic sectors, theoretically and empirically, discussing both neoclassical and behavioural economics approaches to regulation. Regulation has become one of the main determinants of modern economies, and virtually every sector is subject to general laws and regulations as well as specific rules and standards. A traditional argument to justify regulatory interventions is the promotion of public interests. Fixing markets that lack competition, balancing information asymmetries, internalising externalities, mitigating systemic risks, and protecting consumers from irrational behaviour are frequently invoked to complement the invisible hand of the market with the visible hand of the state.However, regulations can lead to unintended consequences, and serve the interests of powerful private interest groups rather than the public interest and social welfare.