July 16, 2015 6:37 AM EDT

Amazon’s recent “Prime Day” is the latest in a series of retailer-created sale events designed to move merchandise.

GREEN MONDAY

Started by eBay in 2007, this event occurs on the second Monday of December. It pulled in sales of $1.6 billion in 2014.

SINGLES’ DAY

E-commerce titan Alibaba created this Nov. 11 event as an anti–Valentine’s Day holiday for China’s single population. Last year it racked up $9 billion in sales.

CYBER WEEK

Home Depot’s event, which began as a 24-hour sale in 2010, now encompasses a full seven days of deals.

BLACK FRIDAY IN JULY

The tradition of offering door-buster deals in the middle of summer (under “Black Friday” branding) was started by Target in 2010; it has since been adopted by Best Buy and others.

–VICTOR LUCKERSON

This appears in the July 27, 2015 issue of TIME.

Contact us at editors@time.com.

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