John T. Shea takes a closer look at the trend changes in Amazon (AMZN) Prime Days. He used to consider the event a "gadget sale" that has since expanded to broad consumer needs. John explains why the Mag 7 giant has evolved its catalog offerings over not just one span of days every year, but several. For October Prime Days in particular, he discusses the importance of holding an event like this as Walmart (WMT) and Target (TGT) expand their deal catalogs.