Why Capital Alone Cannot Drive Long-Term Economic Growth

Naib Alakbarov and Murat Gündüz, writing in Sustainability, analyzed data from 1996 to 2023 to determine how institutional frameworks and research capacity alter the traditional Solow growth model. By examining 224 observations, the researchers found that the explanatory power of their model jumped significantly—from an R² of 0.9415 to 0.9782—when economic freedom and R&D metrics were integrated alongside capital accumulation.

Complements for Productivity

The findings suggest that institutional quality and innovation act as complementary forces rather than isolated variables. While capital deepening provides the necessary infrastructure for growth, its actual impact is dictated by how effectively firms can absorb knowledge and navigate market conditions. In the fully extended model, the economic-freedom coefficient reached 0.5652, while the R&D coefficient stood at 0.2545. This underscores a shift in development logic: growth is less about the volume of investment and more about the systemic ability to convert resources into commercial innovation.

The authors caution against viewing post-2004 regional integration as a direct causal driver of productivity. Instead, they highlight a complex convergence of trade, policy reform, and technological adoption. Because the effects of R&D and economic freedom vary widely between nations—showing stronger correlations in countries like Bulgaria and Romania than others—the study warns against uniform policy prescriptions. For emerging economies, the path to growth relies on building the domestic capacity to adapt imported technology, ensuring that regulatory stability and scientific education keep pace with capital expenditure.