Abstract
We study the pro-competitive effects of international trade, or lack thereof, in models with monopolistic competition, firm-level heterogeneity, and variable markups. Under standard restrictions on consumers’ demand and the distribution of firms’ productivity, we derive two theoretical results. First, although markups vary acrossfirms, the distribution of markups and the share of aggregate profits in revenues are invariant to changes in openness to trade. Second, although the distribution of markups and the share of aggregate profits in revenues are unaffected by trade, gains from trade liberalization are weakly lower than those predicted by the models with constant markups considered in Arkolakis, Costinot, and Rodriguez-Clare (2012).
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