“…Without adequate theorizing, we are often at a loss about what should be measured, how things should be measured, what mechanisms should be tested, and how they should be tested. Consequently, some clear-cut measurements of oil have not been tried: most authors still measure oil in quantity, as oil rents, oil vs. total GDP, oil vs. total export (e.g., Hoeffler 1998, 2004;Fearon and Laitin 2003), (local) oil production (e.g., Humphreys 2005;Brunnschweiler and Bulet 2009;Wimmer et al 2009;Cederman et al 2010;Hunziker and Cederman 2012;Asal et al 2016), oil income per capita (Ross 2006(Ross , 2012, or (relative) concentration/distribution (Morelli and Rohner 2015). Meanwhile, besides several exceptions (e.g., Ross 2004a, pp.…”