Marlon bought a delivery van for his business from Tanita for $20 000. Half of the purchase price was paid with cash, and the other half with a cheque that was payable to bearer. After meeting with Marlon, Tanita took the subway back to her office. Unfortunately, she forgot her purse, which contained both the cash and the cheque that she had received from Marlon, on the subway. After several days of frantic phone calls, it became clear to Tanita that the person who picked up her purse did not intend to return it. Has Tanita necessarily suffered a $20 000 loss? What should she do to minimize the damage? What should Marlon do?