Do currencies become specific by designation in the contract, or do they not?

The Shaykh : This is a recurring issue that will come to us, if Allah wills. Do currencies become specific by designation in the contract, or do they not? The school of thought holds that they become specific by the contract, do you understand? So if we adopt the second view, that they do not become specific, we bring in something else, namely a book for a book, and this becomes specific by consensus, do you understand now? Good.

The questioner : Shaykh, may Allah bless you, it is obligatory...