“…Following Krugman (1980), Rey (2001) develops a threecountry, three-currency model of the world economy to study the emergence of vehicle currencies, with a focus on the role of the pattern of international trade during this evolution. Later contributions with extensive theoretical work in this area include Devereux et al (2004), Bacchetta andvan Wincoop (2005), as well as Goldberg and Tille (2008), which introduce other perspectives like industry features, country sizes, and so on. More recently, Eichengreen (2010) gives a detailed historical account of the rise of the US dollar as an international currency; Devereux and Shi (2013) explore the nature of the efficiency gains arising from a vehicle currency through constructing a dynamic general equilibrium model.…”