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 sever

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.