Trade economists have for long considered gravity models to estimate unexhausted potentials for bilateral trade. Similar to the discrepancy between "normal" and "actual" bilateral trade, one may ask the question about the difference between "normal" and actual bilateral multinational activity....

Recent work in international economics provides insights into the measurement of product variety change - i.e., the change at the extensive margin of trade - and its consequences for a country's welfare. In such work, the measurement of product variety change is typically taken as given. There...