Search Results
Journal Article
Measuring Maritime Disruptions: A Route-Based Index of US Import Exposure
We construct a monthly maritime pressure index that measures US import exposure to disruptions using public trade and vessel-traffic data. The index weights disruptions along shipping routes by the value of imports using those routes, showing which goods are exposed and where they enter the country. It peaked in January 2024, at about five times its 2022–23 average, as the Red Sea disruption coincided with drought restrictions at the Panama Canal. That episode exposed a broad range of nonenergy goods entering mainly through East Coast ports. The 2026 Hormuz disruption was narrower, ...
Working Paper
Evaluating Transportation Improvements Quantitatively: A Primer
How do we evaluate the welfare gains from transportation infrastructure investment? We present a quantitative spatial framework that integrates both traffic and economic responses to infrastructure investment and derive the elasticity of aggregate welfare to improvements in the transportation network. This approach extends the traditional "social savings" method to incorporate agglomeration and dispersion externalities and endogenous traffic congestion. We calibrate the model to the US freight transport network and assess the welfare impact of upgrading segments of the US Interstate Highway ...
Working Paper
A Quantitative Model of the Oil Tanker Market in the Arabian Gulf
Using a novel dataset, we develop a structural model of the Very Large Crude Carrier (VLCC) market between the Arabian Gulf and the Far East. We study how fluctuations in oil tanker rates, oil exports, shipowner profits, and bunker fuel prices are determined by shocks to the supply and demand for oil tankers, to the utilization of tankers, and to bunker fuel costs. Our analysis shows that time charter rates respond only slightly to fuel cost shocks. In response to higher fuel costs, voyage profits decline, as cost shocks are only partially passed on to round-trip voyage rates. Oil exports ...
Working Paper
The Geography of Jobs and the Gender Wage Gap
Prior studies have shown that women are more willing to trade off wages for short commutes than men. Given the gender difference in commuting preferences, we show that the wage return to commuting (i.e., the wage penalty for reducing commute time) that stems from the spatial distribution of jobs contributes to the gender wage gap. We propose a simple job choice model, which predicts that differential commuting preferences would lead to a larger gender wage gap for workers who face greater wage returns to commuting based on their locations of residence and occupations. We then show empirical ...
Working Paper
Costly Commuting and the Job Ladder
Even though workers in the UK spent just 1,000 pounds on commuting in 2017, the economic loss may be far higher because of the congestion externality arising from the way in which one worker's commute affects the commuting time of others. I provide empirical evidence that commuting time affects job acceptance, pointing to large indirect costs of congestion. To interpret the empirical facts and quantify the costs of congestion, I build a model featuring a frictional labor market within a metropolitan area. By endogenizing commuting congestion in a labor search model, the model connects labor ...
Working Paper
How Much Will the Belt and Road Initiative Reduce Trade Costs?
This paper studies the impact of transport infrastructure projects of the Belt and Road Initiative on shipment times and trade costs. Based on a new data on completed and planned Belt and Road transport projects, Geographic Information System analysis is used to estimate shipment times before and after the Belt and Road Initiative. Two sets of data are computed to address different research questions: a global database based on an analysis of 1,000 cities in 191 countries and 47 sectors and a regional database that focuses on more granular information (1,818 cities) for Belt and Road ...
Working Paper
Productivity, congested commuting, and metro size
The monocentric city model is generalized to a fully structural form with leisure in utility, congested commuting, and the equalizing of utility and perimeter land price across metros. Exogenous and agglomerative differences in total factor productivity (TFP) drive differences in metro population, radius, land use, commute time, and home prices. Quantitative results approximate observed correspondences among these outcomes across U.S. metros. Traffic congestion proves the critical force constraining population. Self-driving cars significantly increase the sensitivity of metro population to ...
Working Paper
Monocentric city redux
This paper argues that centralized employment remains an empirically relevant stylization of midsize U.S. metros. It extends the monocentric model to explicitly include leisure as a source of utility but constrains workers to supply fixed labor hours. Doing so sharpens the marginal disutility from longer commutes. The numerical implementation calibrates traffic congestion to tightly match observed commute times in Portland, Oregon. The implied geographic distribution of CBD workers' residence tightly matches that of Portland. The implied population density, land price, and house price ...
Journal Article
Shipping Prices and Import Price Inflation
During the pandemic, there have been unprecedented increases in the cost of shipping goods accompanied by delays and backlogs at the ports. At the same time, import price inflation has reached levels unseen since the early 1980s. This has led many to speculate that the two trends are linked. In this article, we use new data on the price of shipping goods between countries to analyze the extent to which increases in the price of shipping can account for the rise in U.S. import price inflation. We find that the pass-through of shipping costs is small. Nevertheless, because the rise in shipping ...
Working Paper
Negative Externalities and Real Asset Prices: Closing of Stapleton Airport and Effect on Nearby Housing Markets
The closing of a busy airport has large effects on noise and economic activity. We examine the effects of Stapleton airport?s closing on nearby, Denver housing markets. We find evidence of immediate anticipatory effects on prices upon announcement of the closing, but no price changes at closing likely because it was widely anticipated. However, we find that high income and white households delayed moving into these locations until after the airport?s closing. Also, developers upgraded the quality of houses being built after closing. Further, post-closing, these demographic and housing stock ...