"Last mile" delivery is the most salient portion of the supply chain industry, but it is also the most complicated and costly part. In the past, the US has only really relied on UPS, USPS, and FedEx. However, the growth in scale and scope of Amazon, rapidly changing that landscape. What's it like to compete in this industry? How will it change in the coming years, especially with our increasing reliance on those firms during the pandemic? It's big topic that Casey offers some wonderful insight into.