Mobility Zones

Ferdinando Monte

doi:10.1016/j.econlet.2020.109425

Mobility Zones

Econ Lett. 2020 Sep:194:109425. doi: 10.1016/j.econlet.2020.109425. Epub 2020 Jul 18.

Author

Ferdinando Monte^{1

2

3}

Affiliations

¹ Georgetown University, McDonough School of Business, Washington, DC, United States of America.
² NBER, Boston, MA, United States of America.
³ CEPR, London, United Kingdom.

Abstract

This short note constructs Mobility Zones to facilitate the discussion on the geographic extent of individual mobility restrictions to control the spread of Covid-19. Mobility Zones are disjoint sets of counties where a given level of individual mobility directly or indirectly connects all counties within each set. I compute Mobility Zones for the United States and each state using smartphone-based mobility data between counties. The average area and population of Mobility Zones have sharply shrunk around the onset of the epidemic. Pre-Covid-19 Mobility Zones may be useful in calibrating quantitative studies of targeted restriction policies, or for policymakers deciding on the adoption of specific mobility measures. Two examples suggest the use of Mobility Zones to inform within-state differences and cross-state coordination in mobility restriction policies.

Keywords: Covid-19; Individual mobility; Lockdown policies; Social distancing.