Greta decided that it was time to sell her car. However, she was not certain of its value and so, when she advertised the car, she left out the price. When Sam responded to the advertisement, he asked for the price. Greta responded by saying, 'Oh, I don't know. I guess a fair price would be around a couple of thousand dollars'. When Sam arrived the following day with $2,000 for the car, Greta told him that she really meant $2500.