Kia Rae discusses the origins of Black Friday, Small Business Saturday and Cyber Monday and why Americans run out to buy stuff right after a holiday of gratitude. 

https://www.history.com/news/black-friday-thanksgiving-origins-history

https://www.fbfs.com/learning-center/history-of-small-business-Saturday

https://www.rd.com/article/history-of-cyber-monday/