https://phys.org/news/2018-07-amazon-billion-prime-day-sale.html

The glitch was embarrassing but wasn't likely to put much of a dent in Amazon's sales for the event, analysts said. Zentail, an e-commerce operating system, estimated that as of midnight Tuesday Seattle time, Amazon had sold $3.5 billion worth of goods. Amazon shares hit a record high Monday and Jeff Bezos became the richest man in modern history, assuming bragging rights once held by Bill Gates.

The problems of the world's second largest e-commerce provider during its much-hyped sale are a reminder that despite more than 20 years of growth in online sales, the shift to the Internet is not trouble-free.