Amazon is UPS and USPS biggest customer. They have increased the business home delivery by leaps and bounds by creating a market for on-line shopping. The problem is that UPS and USPS (donu2019t know how FedEx fits in) canu2019t do everything that Amazon customers want, such as offer two-hour delivery on food. Amazon may some day compete with UPS/USPS, but they also compete with all the companies that sell products through their on-line shore, this hasnu2019t put anyoneu2019s business out-of-business. It has just grown the pie for everyone.