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The whole point of a shopping cart is for items that you are going to buy--not for things you may (or may not) buy tomorrow. It's a shopping cart. Not a bookmarking service. You don't go into a physical grocery store, put things in your shopping basket, leave, and expect them to be there when you walk in the next day.

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That is your interpretation of shopping carts in web stores. Other people add things to their cart as they need to replace eg: items in the stationery cupboard, then checkout once a week. Some people use the cart as a form of Wishlist, or a picking list while evaluating similar products.

At the very least if a site doesn’t offer Wishlist, shipping list or other bookmarking facilities I would expect the shipping cart to give me a cookie that lasts at least three days to cover the weekend or the option to create an account to save that shopping list/cart to come back to later.

The metaphor is imperfect. It is a staging area for orders in practice, and people like to be able to use it that way. I often build up a shopping cart on several sites while trying to figure out where is the best place to buy from (especially in cases with a shipping is a large proportion of the overall price) and sometimes this takes me several days.

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