Prime Day 2019 is now over, and the stats on it are rolling in. Preliminary analysis published by WD Partners show that the online traffic to the retail site for the event's 1st 24 hours increased 100% compared to the same averaged over the preceding 5 days. This may contribute to the US$400+ billion in takings projected for the company this year.
https://www.notebookcheck.net/Early-analysis-suggests-Amazon-did-very-well-on-Prime-Day-2019.427791.0.html