When determining the value of raw land, there is a relatively fixed amount of supply; therefore, the value of land is primarily determined by demand?
Because land isn't something we can just add in to the world, there is a fixed amount of supply available to us as a resource. When the supply becomes scarce, it is easy for the value of land to go up because if demand is high and there is a low amount the price can be higher since there is less competition of the same.