Abstract
The article examines the methodological limitations of traditional competitiveness theories amid the transition to a polycentric global economy. Using a four-dimensional analytical framework and systemic approach, the study demonstrates that M. Porter’s paradigm, while valuable at micro level, proves insufficient for explaining contemporary structural transformations marked by digitalization, economic sovereignty, and value chain fragmentation. Empirical analysis reveals that Porter’s “diamond” determinants explain only 55–60% of economic growth variations, indicating theoretical gaps. The research highlights digital transformation as a key challenge, fundamentally reconfiguring all components of traditional models through AI, platforms, and new business models. As a theoretical alternative, the article proposes the concept of Sustainable Competitive Advantages (SCA), integrating macroeconomic regulation, industrial policy, and regional cooperation. Using the EAEU and comparative cases (China, Singapore), the study demonstrates the effectiveness of strategic protectionism and industrial cooperation. The findings have practical significance for developing new competitiveness indicators and policy tools adapted to polycentric realities.