Falling living standards during the COVID-19 crisis: quantitative evidence from nine developing countries by Egger, D, Miguel, E, Warren, SS, Shenoy, A, Collins, E, Karlan, D, Parkerson, D, Mobarak, AM, Fink, G, Udry, C, Walker, M, Haushofer, J, Larreboure, M, Athey, S, Lopez-Pena, P, Benhachmi, S, Humphreys, M, Lowe, L, Meriggi, NF, Wabwire, A, Davis, CA, Pape, UJ, Graff, T, Voors, M, Nekesa, C, Vernot, C