Headey, Derek; Alderman, H, 'The relative caloric prices of healthy and unhealthy foods differ systematically across income levels and continents', The Journal of Nutrition, vol. 149(11), pp. 2020-2033, Elsevier BV, 2019
Relative prices of healthy/unhealthy foods have been implicated in the obesity epidemic, but never extensively quantified across countries or empirically linked to undernutrition.