NBER

Long Wang

ShanghaiTech University
421 SEM, No.393 Middle Huaxia Road
Pudong district
Shanghai
China
Tel: +8613882273419

E-Mail: EmailAddress: hidden: you can email any NBER-related person as first underscore last at nber dot org
Institutional Affiliation: ShanghaiTech University

NBER Working Papers and Publications

July 2020Competition and Quality: Evidence from High-Speed Railways and Airlines
with Hanming Fang, Yang Yang: w27475
The entry of High-Speed Railways (HSR) represents a disruptive competition to airlines, particularly for short- to medium-distance journeys. Utilizing a unique dataset that contains the details of all flights departing from Beijing to 113 domestic destinations in China since January 2009, we employ a difference-in-differences approach to examine the effects of HSR entry on the quality of service provided by airlines as proxied by their on-time performance, and to identify the channels through which competition leads to quality improvement. We document two main findings. First, the competition from the entry of HSR leads to significant reductions in the mean and variance of travel delays on the affected airline routes. Second, the reductions in departure delays--which are controlled mostly ...
March 2020Human Mobility Restrictions and the Spread of the Novel Coronavirus (2019-nCoV) in China
with Hanming Fang, Yang Yang: w26906
We quantify the causal impact of human mobility restrictions, particularly the lockdown of the city of Wuhan on January 23, 2020, on the containment and delay of the spread of the Novel Coronavirus (2019-nCoV). We employ a set of difference-in-differences (DID) estimations to disentangle the lockdown effect on human mobility reductions from other confounding effects including panic effect, virus effect, and the Spring Festival effect. We find that the lockdown of Wuhan reduced inflow into Wuhan by 76.64%, outflows from Wuhan by 56.35%, and within-Wuhan movements by 54.15%. We also estimate the dynamic effects of up to 22 lagged population inflows from Wuhan and other Hubei cities, the epicenter of the 2019-nCoV outbreak, on the destination cities' new infection cases. We find, using simula...

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