Musibau, H.2025-05-282025-05-282025Wiley Interdisciplinary Reviews: Energy and Environment, 2025; 1-142041-83962041-8396https://hdl.handle.net/2440/144756OnlinePublThis study employs an innovative instrumental variable (IV) quantile regression approach to analyze the impact of oil price fluctuations and healthcare costs on economic growth across various income levels in OECD countries from 1970 to 2022. The analysis demonstrates that oil prices and healthcare expenditures significantly affect growth in lower-income regions, with these effects diminishing at higher-income levels. These findings underline the necessity for tailored policy interventions that promote sustainable growth by optimizing the benefits of oil prices and healthcare investments while mitigating associated risks, such as inflation. Additionally, enhancing healthcare access in less-developed regions is crucial for fostering inclusive economic progress. The study emphasizes the vital roles of energy markets and healthcare systems in informing effective economic development strategies.en© 2025 The Author(s). Sustainable Development published by ERP Environment and John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.economic growth; energy crisis; health expenditure; OECD countries; quantile–quantile regressionJournal article10.1002/sd.3381732112Musibau, H. [0000-0003-2605-857X]