“…Even if aid affects outcomes in the regions it is given to, the effects might be insufficiently substantial to be measurable at the country-level. This observation has led recent studies to focus on sub-national regions, investigating the effects of aid on development at the province or district level, or even finer sub-national scales (Dreher and Lohmann 2015, Bitzer and Goeren 2018, Isaksson and Kotsadam 2018, Gehring et al 2019, Maseland and Minasyan 2019. However, subnational regressions can be misleading if aid displaces other funds across space which is likely within but not across countries.…”