The most common reason is really simple, but largely unknown: Carts aren’t just for shopping.
A shopping cart isn’t just for holding items until checkout. It also holds items shoppers are interested in while they figure out what to buy. The problem with most sites isn’t cart abandonment; it’s the fact that shoppers have no other way of keeping track of items they are interested in, so they use the only holding bin available, the shopping cart, and then abandon those items when done. They aren’t always abandoning a purchase; they are abandoning their list of unwanted items.
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