“…In this spirit, in addition to the common short-term multiplier or crowding-on effects usually captured in models, some recent CGE studies drawing on growth theory have for instance introduced the positive externalities that public spending on new infrastructure can generate on private 3 activities' output (see e.g. Rioja, 2001;Adam and Bevan, 2006;Estache et al, 2012;Cockburn et al, 2013;Boccanfuso et al, 2014;Borojo, 2015;Chitiga et al 2016;Mbanda and Chitiga, 2017). However, these studies have rarely valued these critical parameters accurately and often take them from the extant empirical literature which has considerably grown up since the seminal works of Aschauer (1989) or Munnell (1992).…”