Amazon (NASDAQ: AMZN) doubled its fulfillment network footprint from 2019 through 2021, but now it's focused on precision and speed. While Amazon has gotten a lot of flack about potentially overbuilding its fulfillment network, it's not going to stop building. The investment is supporting a growing number of same-day shipments for its Prime members, and it could be the key to winning back retail sales from Walmart, Target, and other physical retailers.