“…In what follows, we first show that, with endogenous shifts in trade patterns, taking price differences across destinations no longer correctly nets out marginal costs that are comparable. Second, building on Han (2017), we introduce an estimator that overcomes this problem-we dub it the "Trade Pattern Sequential Fixed Effects" estimator. Lastly, we show how our empirical analysis of the cross-market markup elasticity to the exchange rate can be extended to gain insight into the cross-market supply elasticity to the markup.…”