Product differentiation, interdependence, and the formation of PTAs

We consider the role played by trade in differentiated inputs in the country-pair decision to form a PTA in goods and in their decision to expand it to trade in services with varying degrees of coverage, which transforms a preferential agreement into an Economic Integration Area (EIA). Our baseline model is very successful in predicting the formation of preferential agreements. Our model correctly predicts 84 percent of the country pairs with PTAs in our dataset and can successfully predict the 83 percent of the country pairs that do not form a PTA. Moreover, our model predicts 78 percent of the observations involving country pairs belonging to an EIA when a PTA exists.