The underying idea behand the foundation of the European Union is a single, integrated and competitive market. The future of the entire Western Balkans region (Albania, Bosnia and Herzegovina, Kosovo*, Montenegro, North Macedonia and Serbia) lies within the European Union. The main purpose of this paper is to explore the multiplicative effects of the alignment of European Union regulations with the competition policy in Western Balkan countries. In addition, the paper is designed to highlight the specific issues, challenges in this field, and provides an overview of empirical trends. A combination of qualitative and quantitative approach proposes methodological framework which recognizes different economic environments and regulatory frameworks. By comparing selected economic indicators related to competiton authorities (number of staff in the national authorities, annual budget of the national authorities, number of prohibited agreements, abuse of dominant position, notification of concentrations, opinions), the authors give a reliable basis for comparative progress analysis in this filed. Using multi-criteria optimization as a key method, as well as network and input-output display, the obtained results suggest country whose competition authority is efficient frontier. The significance of this research stems from the current debate whether the harmonized competition policy should speed up and facilitate the process of the accession of new member states to the European Union.