I am an assistant professor in the Department of Economics at the University of Michigan.  My interests are international trade, economic geography and economic growth.  
Contact Information
 Tel: (734) 717-1753
Office:  375 Lorch Hall

We develop a new empirical strategy to estimate external economies of scale using trade data. Across 2-digit sectors, we find scale elasticities ranging from 0.14 to 0.19 and averaging 0.16. We then use our estimates of external economies of scale across sectors to explore the structure and implications of optimal industrial policy. We find that gains from optimal industrial policy are only 0.3% on average across the countries in our sample – this is similar to the gains from optimal trade policy, which are also 0.3% on average.

The Internal Geography of Firms (with Oren Ziv), (Preliminary and Incomplete)
We document four facts regarding the geographic location patterns of firms. Firms' establishments are clustered together; as they expand, firms become more dispersed; larger, more productive firms are more dispersed after adjusting for establishment counts; and establishments that are further away from their firm center are smaller and less productive. These findings are consistent with the hypothesis that firms face internal distance costs and that these costs may significantly affect the geographic distribution of economic activity. We find substantial heterogeneity in our results. Larger firms are less clustered, and firm size appears to attenuate the relationship between dispersion and productivity: establishments of larger firms do not decline in size with distance, and larger firms that are more dispersed are not more productive.

This paper shows that for a wide class of economic geography models the positive implications of trade costs are captured by two reduced form elasticities: the elasticities of wages and population with respect to market access.  It develops a novel IV approach to consistently estimate these elasticities using exogenous changes in the incomes of each location's trading partners.  The approach is implemented using data from U.S. MSAs and finds that wages and especially employment are quite sensitive to differences in market access across cities.  Counterfactual simulations indicate that reducing trade costs would result in large population shifts from the Northeast toward the South and West, along with a flattening of the city size distribution.

    -VoxEU.org column

Specialization is a powerful source of productivity gains, but how production networks at the industry level are related to aggregate productivity in the data is an open question. We construct a database of input-output tables covering a broad spectrum of countries and times, develop a theoretical framework to derive an econometric specification, and document a strong and robust relationship between the strength of industry linkages and aggregate productivity. We then calibrate a multisector neoclassical model and use alternative identification assumptions to extract an industry-level measure of distortions in intermediate input choices. We compute the aggregate losses from these distortions for each country in our sample and find that they are quantitatively consistent with the relationship between industry linkages and aggregate productivity in the data. Our estimates imply that the TFP gains from eliminating these distortions are modest but significant, averaging roughly 10% for middle and low income countries

Econ 641 (International Trade), Fall 2015, Fall 2016, Fall 2017
Econ 441 (International Trade), Winter 2016, Fall 2016, Fall 2017