The simple analytics of the melitz model in a small open economy

"In this paper we present a version of the Melitz (2003) model for the case of a small economy and summarize its key relationships with the aid of a simple figure. We then use this figure to provide an intuitive analysis of the implications of asymmetric changes in trade barriers and show that a decline in import costs always benefits the liberalizing country. This stands in contrast to variants of the Melitz model with a freely traded (outside) sector, such as Demidova (2008) and Melitz and Ottaviano (2008), where the country that reduces importing trade costs experiences a decline in welfare"--National Bureau of Economic Research web site.