Answer: Producer surplus, which is equal to the slope of the supply curve.
Explanation: The producer surplus is represented as the upper portion of the supply curve below the equilibrium price. It is the difference between the amount a producer is willing to sell a given commodity to the actual market price the good was sold at.
The extra benefit which the producer makes as profit when the market price at which the goods was sold at is greater than the amount the producer was willing to sell his goods.