What does faltaría más mean?
Expression
of course — don't mention it
Literally "that would be all we needed": it would be outrageous if it were otherwise. It grants something while implying it never needed asking for. It also works for waving away thanks, like de nada. It sounds courteous and faintly formal, which is why it suits a negotiation, or anyone you do not know well.
—¿Te puedo llamar si tengo dudas? —Claro, faltaría más.
