Is value objective or subjective?
I am not sure this is much debated today as most economists agree that value is subjective.
Objective value dictates that value is taken from the object. This would mean even if there were no one to purchase the apple; the apple still holds a certain value.
Subjective value, on the other hand, is taken from man's use of the object. Using the apple as a reference, the apple holds a value only because it is scarce and someone can use it. It is therefore from the individual that the value is taken and not from the apple itself. The cost of producing the apple does not influence it's value except to the person who went through the action of producing the apple.
There is then multiple amount of subjective values placed on an object as their could be numerous individuals who have use for it. Their value will allow them to bid on the item allowing those who value the object higher to be willing to give up more for it. If the producer values the object more than what others are willing to give, then he would not sell it.