Comment: Submitted to the proceeding of the 2020 World Congress of the Econometric SocietyOptimal transport has become part of the standard quantitative economics toolbox. It is the framework of choice to describe models of matching with transfers, but beyond that, it allows to: extend quantile regression
identify discrete choice models
provide new algorithms for computing the random coefficient logit model
and generalize the gravity model in trade. This paper offer a brief review of the basics of the theory, its applications to economics, and some extensions.