What is the difference between the price and the priced item? And what is the difference between the price and the value?

The questioner : We said that there is a difference between the price and the value... it is what is valued by the general public.

The Shaykh : Yes.

The questioner : ...the criterion for the price is that the letter ba' enters it...

The Shaykh : This is the difference between the price and the priced item. We mentioned the difference between the price and the priced item in the thing that has a price, but he did not ask about the difference between the price and the value.

The questioner : Okay, Shaykh, what is the difference between the value and the price?

The Shaykh : The value is what it is valued by among the general people, and the price is what the contract falls upon. So, if the contract is completed now, what is the price? I sold you a book for a book. If I sold you a book for dirhams, it is clear that the price is the dirhams. But if it is a book for a book, which one is the price?
The student: ...

The Shaykh : Which of the two books?
The student: ...

The Shaykh : The one that the letter ba' did not enter is the price. Yes, you say, "I sold Ibn 'Aqil's commentary for *Awadh al-Masalik*," so what became the price?
The student: *Awadh al-Masalik*.

The Shaykh : And I say, "I bought Ibn 'Aqil for *Awadh al-Masalik*"?
The student: *Awadh al-Masalik*.

The Shaykh : *Awadh al-Masalik*, is that right?
The student: Yes.

The Shaykh : This is it, yes?

The questioner : Does the price of a dog attach to... the price of a cat? Is that permissible?

The Shaykh : Perhaps you are reversing it; that would be more accurate...

The questioner : ...