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This might have been true in the past but from anecdotal evidence a lot more people seem to actually shop on their mobile phones nowadays where switching between tabs is less convenient. They build their item shortlist using shops' wishlist features or just add them to the cart.

A source would be nice but speaking from my own experience I do this. mainly so I can switch between tabs to see the "selections" I've made. It make intuitive sense to me at least regardless of the source.

I do this as well, but then just using a desktop computer makes us a minority.

My wife, who also mainly uses a desktop computer (though she uses her phone a lot more than me) does rarely do that. Instead, she uses wishlists/shopping carts, and even pinterest to organize things.

It's more of a number I pulled from what I hear, but I do see your point on sourcing so I just changed it to "So many" instead