You didn't provide the curve, however, the more consumers want a product the larger will be the supply needed as well as the price they're willing to pay for it. The price of a product rises in demand and drops when nobody wants it. Also the scarcity of it influences this so the most expensive things are those that are rare, that is have a small supply, and yet are wanted by people a lot. If there's an abundance of something and it's not wanted then the price will be the lowest.
