Parra, María Dolores; Martínez-Zarzoso, Inmaculada - 2015
that firms that both export and import are the most productive, followed by importing-, exporting-only firms and nontraders …. Secondly, the authors estimate the determinants of the extensive and intensive margins of exports and imports using dynamic … imports than for exports pointing to the existence of sunk costs in both activities. Moreover, past productivity does affect …