Is one allowed to pay someone as much as he wishes because his friend was nice to him or bought him a pizza. This is not a case of ribit because no one is borrowing. if someone buys someone lunch can the person receiving the lunch pay the person as much as he wants? thanks
If the pizza as bought for him as a present, and he is in turn giving him back a present, you can give someone a present as much as you like. However if it was understood that he will be paid for his buying the pizza, then it would be considered a loan.