An Extension of the Trade Restrictiveness Index to Large Economies*

The Trade Restrictiveness Index (TRI) introduced by Anderson and Neary (1994 ) provided the first theoretically satisfying measure of a country’s tariff structure by overcoming the problem of ad hoc specification of indexing weights and the related index number problem. We observe, however, that the TRI may not exist or may not be unique when countries are large. As a remedy, we propose a simple extension.