Rambam - Malveh veLoveh - Chapter 9 paskens א. אין פוסקין על הפירות עד שיצא השער An order for produce cannot be placed until a market price has been established. according to the mishnah in ...
Are early-bird discounts ribbis? For example, "buy before March 1, 10% off", or "tickets $12 in advance, $15 at the door" Inspired by http://myparnasa.com/collecting-interest-ribbis/
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 ...