“…Anderson and Yotov (2010), Donaldson (2008), Caliendo and Parro (2010), Costinot, Donaldson, and Komunjer (2010), Hsieh and Ossa (2011), Zhang (2011), Ossa (2012), Shikher (forthcominga), and Shikher (forthcomingb). Formally let us assume that the representative agent in 12 In this special case, one can show that the welfare impact of changes in the number of domestic varieties (if any) exactly compensates the welfare impact of changes in the number of foreign varieties (if any), as emphasized in Feenstra (2010).…”