Producer Surplus Location on Supply-Demand Graph

Steps:

• Recall producer surplus measures gains to sellers from selling at equilibrium price above their minimum willingness to sell.
• Visualize standard graph: upward-sloping supply curve, downward-sloping demand, intersecting at equilibrium price (horizontal line).
• Identify surplus area: from equilibrium quantity back to origin, bounded below by supply curve and above by equilibrium price line.
• Confirm by definition: surplus equals total revenue minus total variable costs, represented by that triangular area.

Why A is correct:

• Producer surplus is defined as the area above the supply curve (minimum prices producers accept) and below the equilibrium price (actual revenue received), forming a triangle up to equilibrium quantity.

Why the others are wrong:

• B describes consumer surplus, which is above equilibrium price and below demand curve.
• C inverts the boundaries; no surplus exists below supply curve.
• D represents total producer costs or revenue, not surplus.

Final answer: A