These are all datasets derived from sources in the public domain. Please find below references and links to sources. Refer to websites for conditions of usage. Center for Systemic Peace (2018), ‘Polity5 annual time-series, 1946-2018’. Data retrieved from: https: //www.systemicpeace.org/inscrdata.html [Last accessed: January 4th 2023]. Dür, A., Baccini, L. & Elsig, M. (2014), ‘The design of international trade agreements: Introducing a new database’, The Review of International Organizations 9(3), 353–375. United Nations (2020), ‘Human Development Index (HDI)’. Data retrieved from: https://hdr.undp.org/ en/indicators/137506 [Last accessed: January 4th 2023]. WID (2022), ‘World Inequality Database’. Data retrieved from: https://wid.world [Last accessed: January 4th 2023]. World Bank (2022), ‘World Bank country and lending groups’. Data retrieved from: https://datahelpdesk.worldbank.org/knowledgebase/articles/ 906519-world-bank-country-and-lending-groups [Last accessed: January 4th 2023].