Graph 6. When a market does not produce at its efficient point there is a deadweight loss to society. The yellow triangle represents the lost consumer surplus and the red triangle represents the lost producer surplus when the market operates at the monopolistic output instead of the competitive output.The lost consumer surplus plus the lost producer surplus is the total deadweight loss to society. Graph 7.roducer surplus is defined by the area above the supply curve, below the price, and left of the quantity sold. Graph 2. The yellow triangle in the above graph represents consumer surplus. Consumer surplus exists when the price paid by a consumer is less than what the consumer would be willing to purchase the good for.