“…This paper is related to previous studies on trade duration at the product‐country level (Besedeš & Prusa, 2006a, 2006b), firm level (Kostevc & Zajc Kejzar, 2020), firm‐product level (Görg et al, 2012), firm‐country level (Esteve‐Pérez et al, 2013), firm‐product‐country level (Cadot et al, 2013) and to studies on the dynamics of firms’ export portfolio (Amador & Opromolla, 2013; De Lucio et al, 2016; Freund & Pierola, 2010). Yet, the previous papers on portfolio dynamics have focussed on switching patterns of export products and destinations without explicitly examining trade duration.…”