 Amazon, by the way, is a marketplace underwriter. That pressure has forced retailers and shipping companies to completely rethink the way they store, manage, and move goods, all in an effort to shave minutes off the process. Marketplace's Kristen Schwab took a trip out to UPS's shipping hub in Louisville, Kentucky, to take a look at exactly how the stuff we buy gets to our doorsteps and gets there fast. Here's part one of Kristen's story.