Estimating Demand for Bike-shares with Stockouts (Apr 2024)
How many more bike-share trips would be taken if bikes and docks could always be available for commuters who want to use them? This paper develops a novel method for estimating demand in the presence of stockouts and applies it to study New York City’s bike-share system. The results indicate that on average, demand for bike-share trips would be twice as high if stockouts could be eliminated. During periods of high demand, more than 60 percent of commuters whose first-choice bike-share trip is out-of-stock choose not to take bike-share at all rather than substitute to an alternative in-stock trip. These results have major implications for urban transportation and the environment. Stockouts are a major barrier preventing bike-shares from serving as a viable mode of sustainable urban transportation.
Imputing Missing Values in the US Census Bureau's County Business Patterns (Jan 2021) (Data files) - w/ Fabian Eckert, Teresa C Fort, and Peter K Schott
The County Business Patterns data published by the US Census Bureau track employment by county and industry from 1946 to the present. Two features of the data limit their usefulness to researchers: (1) employment for the majority of county-industry cells is suppressed to protect confidentiality, and (2) industry classifications change over time. We address both issues. First, we develop a linear programming method that exploits the large set of adding-up constraints implicit in the hierarchical arrangement of the data to impute missing employment. Second, we provide concordances to map all data to a consistent set of industry codes. Finally, we construct a user-friendly, 1975 to 2016 county-level panel that classifies industries according to a consistent set of 2012 NAICS codes in all years.
When Do Voters Change Their Minds? The Case of Congestion Pricing in New York City
No Way to the Highway: The Political Economy of Highway Revolts - w/ Sara Bagagli
When Should Urban Roads Be Removed to Lower Carbon Emissions? - w/ Dominique Bureau and Lea Bou Sleiman
The Political Economy of Congestion Pricing: Evidence from London (slides)
Do young people have the skills to compete in a global market? (22 June 2016) - Education Policy Institute, London