A contrary viewpoint is argued in a 2003 study by Michael E. Smith and Lisa Montiel who compare the archaeological record related to Tula Hidalgo to those of the polities centered in Teotihuacan and Tenochtitlan. They conclude that relative to the influence exerted in Mesoamerica by Teotihuacan and Tenochtitlan, Tula's influence on other cultures was negligible and was probably not deserving of being defined as an empire, but more of a kingdom. While Tula does have the urban complexity expected of an imperial capital, its influence and dominance was not very far reaching. Evidence for Tula's participation in extensive trade networks has been uncovered, for example, the remains of a large obsidian workshop