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I will ask the question using the following scenario:

Reuvan wrote a sefer that he was charging for it 50 Shekels. Came along Shimon who wanted to buy the sefer. At that time he didn't have money on him so Reuvan agreed to give him the sefer now and that he could pay later. When Shimon came to pay a few days later he decided he wanted to give Reuvan a 100 shekels for the sefer instead of 50. His intention in giving it was to be for his (Reuvan's) benefit since he is a Talmud Chacham and wants to give him more for this sefer. Is there any problem of ribis with such a situation?

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Is there a problem of interest with giving someone a gift? – b a Jan 11 '13 at 1:07
Isn't ribis on the lender (or seller in your case). Not the giver/buyer? – Ariel Jan 11 '13 at 1:38
@ba Even when it is meant as a gift, there could be a problem of mechezei k'ribis. – Fred Jan 11 '13 at 2:37
@Ariel It is forbidden for all parties (Bava Metzia 75b), and even if the ribis is only d'rabbanan the borrower still violates lifnei iver. – Fred Jan 11 '13 at 2:38

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