A : What are you looking for?
B : I need a sweater but first I need a new T-shirt.
A : OK. What about these two? Which one do you prefer?
B : Which one is more expensive?
A : The white one.
B : How much is it?
A : It is 75 pounds.
B : Err. What about the green one?
A : It's 50 pounds.
B : I think the white one is better than the green one.
A : Yes, but the green one is cheaper.
B : I'm not surprised.