Shopping cart abandonment is a HUGE problem that online retailers must address (see this post, for example).
As Erin Lynch reports for Multichannel Merchant: “Shopping cart abandonment is a major E-commerce concern, especially when nearly 72% of Web site visitors add items to their carts but never complete their purchase. In the infographic below from SeeWhy, you will learn about the buying behaviors of new shoppers, what happens when regular customers abandon their carts for a second time, and of those who return to your site is actually going to buy again.”
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