@SealOrNoSeal asks
my friend gave me their binder to bring. Can I make a good trade for them if I know they'd probably like it?
Jeff answers
I'd get explicit permission for the specific trade or clear limits before agreeing to anything. “Probably” is too much responsibility when someone else's favorite is involved. Photograph the proposed cards and ask them. Bringing a binder for a friend doesn't automatically make you its decision-maker.
— Jeff, infinitepulls.com