Producer's surplus at price p is the vertical distance between the supply curve and the demand curve at price p.

Producer's Surplus

The difference between the amount a producer is willing to accept for a good or service and the actual amount received from its sale.

Supply Curve

A graph showing the relationship between the price of a good and the amount of it that suppliers are willing to produce and sell, under the assumption of other conditions being constant.

Demand Curve

A graphical representation showing the relationship between the price of a good and the quantity of that good demanded by consumers.