There are many PRICES for a House:
There is the Price that the owner's think it is worth.
There is the Price each Buyer thinks it is worth.
There is the Appraised Value.
The Assessed Value,
There is the Market Value as determined by a CMA.
And there is the SELLING PRICE, when someone actually BUYS the house.
All of these will probably be different, although each can be vigorously defended by its proponent.
The only one that is concrete, is the SELLING PRICE; because, by definition, a "willing and able buyer put up their money, and the Sellers accepted.
Everything else is just OPINION.