Do the question by using whatever resources you choose.
A few years ago I needed to replace my car. I thought the quickest and cheapest way to do it was to put an advertisement in the local paper. I looked up the value of the car and priced it at exactly that level. Two people came in the first week to view the car. One was not serious about buying, and the other offered to buy it for two thirds of the asking price. I asked him to raise the offer to 80 of the price and he refused. I thought this was unreasonable. I had to advertise a second time and the car was sold for about 60 of the price I was asking.