“…In most of the conventional literature, the tax methods are compared within a single-country framework in which consumers are forced to buy a domestic product irrespective of the level of prices and taxes. In contrast, more recent studies have considered cross-border shopping, trade, firm relocation, and capital mobility in a two-country model when analyzing the effects of a unit tax and an ADV tax [Lockwood and Wong (2000), Lockwood (2004), Jorgensen and Schröder (2005), Akai et al (2011), Takatsuka (2013), Aiura and Ogawa (2013), and Akai et al (2014)]. 3 1 For example, Delipalla and Keen (1992), Skeath and Trandel (1994), Myles (1996), Denicoló and Matteuzzei (2000), Anderson et al (2001), and Blackorby and Murty (2007) examined non-equivalence of unit and ADV taxes in a monopoly and in an oligopoly.…”