Online used-car dealers like Shift, Vroom, and Carvana have seen record sales over the past year, as the pandemic and chip shortages upended the US auto market (Kyle Stock/Bloomberg)

Kyle Stock / Bloomberg:
Online used-car dealers like Shift, Vroom, and Carvana have seen record sales over the past year, as the pandemic and chip shortages upended the US auto market  —  In December, David Tvaltchrelidze bought a 2016 Mazda Miata for $16,450 from Shift Technologies Inc., one of a crop …