https://www.brookings.edu/articles/the-hutchins-center-explains-the-neutral-rate-of-interest/
https://www.brookings.edu/blog/up-front/2018/07/12/as-trump-twists-natos-arm-lets-run-the-math-on-defense-spending/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=64421876
https://cepr.org/sites/default/files/policy_insights/PolicyInsight91.pdf
https://www.politico.com/news/2023/04/11/china-lending-imf-world-bank-00090588