“…Rather, countries join GTAs largely in accordance with economic reasoning (see Baier & Bergstrand, ; Baier and Bergstrand, ; Egger, Egger, and Greenaway, ; Egger & Larch, ). More recently, Egger and Wamser (), Cole and Guillin (), Egger and Shingal () and Sauvé and Shingal () have built on this work on GTAs and explored determinants of STA membership. The services literature has also evolved to explain services commitments in the GATS (Egger & Larch, ; Roy, ), reciprocity in STA commitments (Marchetti, Roy, & Zoratto, ) as well as GATS+ commitments in STAs (van der Marel & Miroudot, ).…”