“…Previous research has investigated the impact of the introduction of the potato (Nunn and Qian, 2011), the introduction of the heavy plow (Andersen et al, 2016), the introduction of maize (Chen and Kung, 2016), the introduction of genetically modified soy beans (Bustos et al, 2016), the Green Revolution (Gollin et al, 2016), agricultural policy in China (Marden, 2016) and changes to agricultural policy (Carillo, 2018). Some of this research focus on developments in the past and other in the present (see also, Ashraf and Galor (2011) for the effect of agricultural productivity on development till 1500).…”