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    EVALUATING THE EFFICIENCY OF COMPANIES IN THE BORSA ISTANBUL CORPORATE GOVERNANCE INDEX USING DATA ENVELOPMENT ANALYSIS
    (Deniz Publication, 2024) Sahin, Zekeriya; Çora, Hakan
    This study examines the efficiency of companies listed in the Borsa Istanbul (BIST 100) Corporate Governance Index for the year 2023 using Data Envelopment Analysis (DEA). DEA, a non-parametric method, was applied to 46 companies to evaluate their ability to maximize outputs given available inputs. The analysis employed an output-oriented Charnes, Cooper, and Rhodes (CCR) model, implemented through the Efficiency Measurement System (EMS) software. The findings revealed that 15 companies were relatively efficient, while 31 were inefficient, resulting in an overall efficiency rate of 32.6%. These results underscore the importance of robust corporate governance standards in enhancing organizational performance. The study identified corporate governance principles, such as transparency, accountability, and stakeholder engagement, as critical factors influencing efficiency. Recommendations to improve inefficiencies include strengthening governance standards, implementing training programs, and fostering transparency and accountability. The study contributes to the existing literature by providing empirical evidence of efficiency levels within Turkey's Corporate Governance Index and highlights the ongoing challenges and opportunities for improving corporate practices. The results also serve as a valuable reference for investors and policymakers seeking to enhance the performance of publicly listed companies and promote sustainable growth. Future research could expand by incorporating different variables and periods to assess longitudinal changes in corporate efficiency. © 2024 Journal of Organizational Behavior Research.
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    Nexus among Renewable Energy, Economic Growth, Technology Innovation, CO2 Emissions, and Life Expectancy in NAFTA: What’s the Forum’s Response Amid Time Frequencies?
    (Econjournals, 2025) Fumey, Michael Provide; Ansah, Mordecai Akondoh; Taha, Amjad; Sahin, Zekeriya; Sackitey, Gabriel Mordzifa; Yeboah, Samuel Duku
    This study examines the nexus between renewable energy (RE), economic growth (ECOG), technological innovation (TEI), CO2 emissions, urbanization (URB), and life expectancy (LEX) in NAFTA countries driven by the sustainable development framework. Using advanced wavelet coherence with data from 1990M1-2023M12, along with WAMC techniques, the analysis revealed intricate temporal and frequency-based interactions. Technological innovation and renewable energy boost life expectancy by reducing environmental degradation. As for urbanization and economic growth, these modified results anticipate dependent variables by the quality of infrastructure and policies. In the short run, tested causality relationships between variables show non-directional, while medium-and long-term scenarios evidence mutual reinforcement of the variables with life expectancy leading to renewable energy adoption and emissions reduction. The tests confirm WAMC’s almost perfect integration of factors within time scales, stressing thus their collective outcome on life expectancy. Therefore, this study emphasizes the status of appropriate sustainable policies integrating health, energy, and environmental objectives and creating effective measures toward long-term sustainability in NAFTA. © 2025, Econjournals. All rights reserved.