13. Abdulla agrees to sell his house to Ahmed at the market price. Is the sale valid under Islamic finance? 1. Yes, the sale is valid because it is not fair that Abdulla loses money should the market price go up. At the same time, it is not fair that Ahmed pays too much for the house should the market price go down 2. No, the sale is not valid because Abdulla and Ahmed did not sign a written bilateral contract agreement specifying this condition 3. Yes, the sale is valid because both Abdulla and Ahmed agree to this condition and therefore they enter into a bilateral contract agreement 4. No the sale is not valid because the specific price has to be stated under the Islamic finance contract requirements