>I've seen cart abandonment drop by 50% or more simply by including shipping price and policies on the pricing page.
To be fair I assume that some number of people never start shopping because they don't like the shipping policies.
That said, people have gotten conditioned with a lot of "free" shipping or free shipping over a certain amount. So when they hit final checkout and are presented with what seems to be expensive shipping, they'll often almost reflexively close the page.
>People will spend $20 extra to hit the $50 minimum free shipping threshold than spend $5 on shipping for a $30 order.
Raises hand :-) I think the shipping charge feels like throwing money away. Whereas adding the item feels like "Surely I can find some item I want at effectively a 25% discount." But, yeah, most of this isn't economically rational. It was all very eye-opening when I was first exposed to this sort of thing 30 years ago and it's been useful in a lot of contexts.