Because of the balance and harmony between each part.
Hope this helps!! (:
I am assuming you are talking about the graph.
The monopoly will probably choose the Price 1 x Quantity 1 = that means, Point B
B, Resistor. It's "resisting" the flow of electricity, but doesn't completely stop it. While resisting the flow, the resistor can produce the electrical energy into heat and/or light.
The correct answer is B which is scarcity