When it comes to Bitcoin, its price is mostly dependent on the buying and selling of it. If people buy more Bitcoin than they sell, then Bitcoin's price will increase and it's the opposite in the other case.
with everything.. they can be bought and sold..
but that does not reveal the VALUE of the item. it just sets the PRICE
the value sits below the retail price and if the PRICE is low then the price is near value by being near value. but again you still need to learn how to calculate value