Larch, Mario; Norbäck, Pehr-Johan; Sirries, Steffen; … - 2013
significantly reducing the downward bias from omitting zero trade flows than it reduces the upward bias from omitting the number of … heterogeneous exporting firms. Furthermore, we show that including zero-trade flows cannot solve the distance puzzle when using HMR … puzzle ; gravity estimation ; zero trade flows ; firm heterogeneity …