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4. Gordon, R. J. (2016) The Rise and Fall of American Growth: The U.S. Standard of Living since the Civil War. The Princeton Economic History of the Western World. Princeton University Press
5. IMF (2023) ‘The Natural Rate of Interest: Drivers and Implications for Policy’, chapter 2 of World Economic Outlook. A Rocky Recovery. pp. 45–68. Washington DC : International Monetary Fund