This report by Enrico Letta assesses the European Union's Single Market, identifying challenges to its effectiveness and proposing solutions. It emphasizes the need for increased economic security, a strengthened rule of law, and deeper integration across various sectors, including finance, energy, defense, and healthcare. The report advocates for regulatory simplification, enhanced digital infrastructure, and greater SME participation in the Single Market to achieve sustainable economic growth and prosperity. Finally, it stresses the importance of financial integration and addresses concerns about regional disparities within the EU.