Assistant Professor of Economics
Department of Economics
Vanderbilt University
VU Station B, Box #351819
Nashville, TN 37235
Google Scholar Profile

I am an Assistant Professor of Economics at Vanderbilt University. My main area of research is macroeconomics, focusing on investment dynamics over the business cycle. My work investigates residential investment in the housing boom and bust, inventory investment in business-cycle models, cyclical durable investment with second-hand markets, and fiscal policy in the great recession. I received my B.A. degree from Seoul National University (Republic of Korea) and my Ph.D. from Columbia University.


Time to build and the real-options channel of residential investment

Journal of Financial Economics, accepted (with Chamna Yoon).


Abstract: A standard real-options model predicts that time-to-build investment decisions could be delayed by uncertainty over future revenue. We quantify the first-order importance of this mechanism in the recent housing boom-bust cycle by developing and estimating a model of sequential irreversible investment with stochastic bottlenecks. We find that the main driver of construction delays during the boom is construction bottlenecks. However, further delay in construction during the bust is caused by an increase in uncertainty, which grew by 21.6% between 2002 and 2009. The model can account for more than one-third of the decline in residential investment between 2002 and 2009.

What do inventories tell us about news-driven business cycles?

Journal of Monetary Economics, 79, May 2016, 49-66 (with Nicolas Crouzet).

Working paper version Working paper appendix

Abstract: There is widespread disagreement over the quantitative contribution of news shocks to business-cycle fluctuations. This paper provides a simple identifying restriction, based on inventory dynamics, that tightly pins down this contribution. Structural models predict that finished-good inventories should fall when there is an increase in consumption and investment induced by news shocks. A structural VAR with these sign restrictions indicates that news shocks account for at most 20 percent of output volatility. Since inventories comove positively with consumption and investment in the data, shocks that generate negative comovement cannot account for the bulk of fluctuations.

Targeted transfers and the fiscal response to the great recession

Journal of Monetary Economics, 59(S), December 2012, S50-S64 (with Ricardo Reis).

VoxEU column Working paper version Appendix Replication files

Abstract: Between 2007 and 2009, government expenditures increased rapidly across the OECD countries. While economic research on the impact of government purchases has flourished, in the data, most of the increase in expenditures was in government transfers. After documenting this fact, we argue that future research should focus on the positive impact of transfers. Towards this, we present a model in which there is no representative agent and Ricardian equivalence does not hold because of uncertainty, imperfect credit markets, and nominal rigidities. Targeted lump-sum transfers are expansionary both because of a neoclassical wealth effect and because of a Keynesian aggregate demand effect.


The role of durables replacement and second-hand markets in a business-cycle model

March 2018. [R&R in Journal of Money, Credit and Banking]


Abstract: Transactions of used durables are large and cyclical, but their interaction with purchases of new durables has been neglected in business-cycle studies. I fill in this gap by introducing a new business-cycle model of durables where households resell their goods to the second-hand market and the production of new durables is affected by the supply of used goods. The model delivers three conclusions: markups are smaller for goods that are more durable and more frequently replaced; markups are countercyclical for durables, resolving the comovement puzzle of Barsky, House, and Kimball (2007 American Economic Review); and procyclical replacement demand amplifies durable spending.

The international diffusion of the automobile from 1913 to 1940

November 2018 (with Dong Cheng, Mario Crucini, and Hakan Yilmazkuday).

Abstract: The first half of the twentieth century provides an unparalleled opportunity to explore the interaction of rapid technological progress and natural and official barriers to international trade in shaping the worldwide diffusion of a new and highly traded good: the automobile. Because the United States was unrivaled in both the production and trade of passenger automobiles, U.S. domestic prices of automobiles provide the source price. To supplement this, we scrape historical data on quantity and value of passenger vehicles exported from the U.S. to approximately 80 destinations, annually from 1913 to 1940. We model the rise of the automobile from global obscurity to a fixed point which depends on GDP per capita, and with the transition path depending on the evolution of the relative price of the automobile in the U.S. and its pass-through to destination markets. We then attribute the ten-fold gap in diffusion levels between the U.S. and other countries to international price frictions: markups, tariffs, trade costs, and Penn effects.

The effective interest rate lower bound in a small open economy: The case of Korea

October 2018 (with Young-Kwan Kang).

Abstract: We estimate the macroeconomic effect of monetary policy shocks in Korea using a vector autoregressive model, accounting for differential effects when the policy rate in Korea is close to or lower than the US federal funds rate. We find that the Korea-US policy rate difference matters for the response of output. Lowering the policy rate boosts production only when the Korea-US policy rate difference is notably large. Our empirical results suggest that the US federal funds rate is an effective lower bound for discretionary monetary policy in Korea.


How durable are consumer durables over the business cycle?

(with Seunghoon Na)

Time on the market and price responses: Evidence from new house sales

(with Chamna Yoon).

Inventory disinvestment spikes

(with Nicolas Crouzet).