His research primarily focuses on methods for estimating consumer demand, plant-level productivity, and the contribution of the continual reallocation of inputs across plants to economic growth. In the area of demand estimation, he has applied new econometric techniques to a variety of markets - motion pictures, automobiles, cable television and satellite dish, and Medicare Advantage - to assess how innovation and trade affect consumer and producer welfare. His empirical work on input reallocation shows that increased barriers to the movement of inputs results in significantly lower growth in per capita GDP in the four countries which he has examined, including the United States, Chile, Colombia, or Slovenia.