Antras, Pol; Helpman, Elhanan; Aghion, Philippe - National Bureau of Economic Research (NBER) - 2004
. Furthermore, the model generates both building bloc' and stumbling bloc' effects of preferential trade agreements. In particular …, we describe an equilibrium in which global free trade is attained only when preferential trade agreements are permitted … to form (a building bloc effect), and an equilibrium in which global free trade is attained only when preferential trade …