The answer is: Supply curve
To show equilibrium, a graph should contains both supply curve and demand curves.
Supply curve would represent the price of the product and the quantity that the suppliers willing to provide at each price points. For most goods, the quantity of the supply would increase as the price of the products rises.
In order to be at equilibrium the supply curve has to be on the graph.
This is the point on the supply and demand graph where both the demand curve and the supply curve meet and intersect.
The point of intersection is the equilibrium. At this point, the quantity supplied is equal to the quantity demanded.
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