This report delves into the multifaceted impacts of EU enlargement on businesses. It begins with an introduction to the European Union, its expansion, and the waves of integration, highlighting the historical context and the process of enlargement. The main body of the report analyzes the benefits firms derive from EU enlargement, including increased export potential, access to a diverse labor market, a safer business environment, and an expanded market size. Furthermore, it examines how these factors can lead to efficient allocation of labor and improved living standards. The report also addresses the disintegration of the EU, specifically focusing on Brexit and Article 50 of the Lisbon Treaty. The report provides two key recommendations for firms to enhance their competitiveness: investing in technological infrastructure and developing a strong team through training and collaboration with strategic partners. The conclusion summarizes the key findings and reinforces the significance of these factors for EU firms. The report references several academic sources to support its arguments.