It has something to do with both prices. It's hard to say which one is closely related to. Calling the purchase price means that someone is willing to pay this price; Hawking means that someone wants to sell it at this price. Then if you are in a hurry to buy, enter "selling price" and you will make a deal right away. But if you are not in a hurry, you can hang it a little higher than the original "bid". So if someone wants to sell it, they will sell it to you first.

As you mentioned. Eager to buy, 4760 entered the market. If you are not in a hurry, you can wait for the price of 4680 or 4700.