Using population-level mobility models, UCLA mathematics professor Mason Porter and his collaborators investigated customer mobility flow between supermarket zones. Previously, similar types of models have been used on much larger spatial scales, such as intracity and intercountry scales. This case study of human mobility on small spatial scales gives insight both into how customers move in supermarkets and into how retailers can arrange stores to reduce congestion. The paper was published in Physical Review E [Phys. Rev. E 100, 062304] on December 9, 2019.