“…The value ranges from 20 (for a pair of completely autocratic states) to 20 (for a pair of fully democratic states). Numerous studies have shown that a pair of democracies is more likely to enter PTAs because democratic leaders utilize PTAs to increase public support for their political tenures (Drury, Krieckhaus & Yamamoto, 2014;Liu, 2008;Mansfield et al, 2002;Yamamoto Rosenbaum & Krieckhaus, 2016). At the same time, several studies suggest that highly democratic countries are prone to choose bilateral PTAs over multilateral PTAs, as bilateral PTAs can bring deals more customized to benefit member states and, therefore, find it easier to pass a long ratification process at home (Levy, 1997;Mansfield & Milner, 2012;Molders, 2012).…”