During any trip to the grocery store, you probably come across an empty shopping cart pushed into a corner and full of items a clerk will eventually have to put away. Fortunately for the store, this doesn’t happen frequently—if it took place in stores as often as it does online, the aisles would be filled with carts. According to a study by SaleCycle, 3 out of 4 online consumers leave merchandise in their shopping carts unpurchased.

Although retailers with an online presence don’t have to restock their virtual shelves, cart abandonment still presents a massive lost opportunity for retail in general—a $4.6 trillion opportunity in 2016 alone.

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