Research

Fiscal Policy, Portfolio Frictions, and International Transmission  [Nada es Gratis Blog (spanish)]

I offer a unified explanation for two puzzles in international economics: (i) the tendency for fiscal expansions to depreciate the exchange rate and increase net trade, and (ii) the exchange rate disconnect — the near-random-walk behavior of exchange rates uncorrelated with macroeconomic fundamentals. I present new evidence showing that debt-financed US fiscal expansions lead to deviations from uncovered interest parity, favoring dollar-denominated assets, and increases in US gross foreign assets, contrary to predictions of standard models. I propose a model where portfolio rebalancing frictions drive the international transmission of debt-financed fiscal expansions and generate exchange rate dynamics consistent with the disconnect.

Real Exchange Rate and Net Trade Dynamics: Financial and Trade Shocks (with Soo Kyung Woo) 

Revise & Resubmit, Journal of International Economics

This paper studies the drivers of the US real exchange rate (RER), with a particular focus on its comovement with net trade (NT) flows. We consider the entire spectrum of frequencies, as the low-frequency variation accounts for 61 and 64 percent of the unconditional variance of the RER and NT, respectively. We develop a generalization of the standard international business cycle model that successfully rationalizes the joint dynamics of the RER and NT while accounting for the major puzzles of the RER. We find that, while financial shocks are necessary to capture high frequency variation in RER, trade shocks are essential for the lower frequency fluctuations. 

Mitigating International Supply-Chain Risk with Inventories and Fast Transport (with George Alessandria, Ryan Monarch, and Kim Ruhl, draft coming soon)

We study, theoretically and empirically, how firms use inventories and alternative transport modes in the presence of demand and supply shocks. We build an sS model of an importer reselling an input subject to stochastic demand with fixed and variable input ordering costs that differ by the speed of shipment. We show that 1) U.S. supply chains outside of NAFTA can be managed like those in NAFTA using air shipments; 2) having the option to ship products by air is valuable and the value is proportional to the reduction in inventories; 3) large positive industry demand shocks are accommodated by a shift to air; 4) distant supply chains can better adjust to large industry demand shocks owing to the extra inventories on hand and the ability to shift to air shipment. We show our model captures the margins of adjustment in Personal Protective Equipment trade following the COVID shock.