●Deadweight loss(无谓损失)-Net loss of total(consumer plus producer)surplus. The price of a good has been regulated to be no higher than Pmax,Which is below the market-clearing price Po. The gain to consumers is the difference between rectangle A and triangle B(A-B). The loss to producers is the sum of rectangle A and triangle C (A+C).Triangles B and C together measure the deadweight loss from price controls(B+C).⚫ Deadweight loss (无谓损失) - Net loss of total (consumer plus producer)surplus. ◆The price of a good has been regulated to be no higher than Pmax, which is below the market-clearing price P0 . The gain to consumers is the difference between rectangle A and triangle B (A-B). The loss to producers is the sum of rectangle A and triangle C (A+C). Triangles B and C together measure the deadweight loss from price controls (B+C)