↔ S D $8.00 6,000 $10.00 4,000 Output (thousands of units) Price ($ per unit) Monopoly rent Ricardian rent Social loss (deadweight loss) Licensed output 4,000 units: price rises to $10.00; the open market would supply 6,000 at $8.00. The dotted rectangle is monopoly rent: $2 × 4,000 units, transferred from buyers by the locked gate. The loss triangle is different — units 4,000 to 6,000 were worth more to buyers than their suppliers' cost, and they simply go unmade.

Drag the red licensed-output line left or right (or focus it and use the arrow keys). At 6,000 the restriction stops binding.