Market Failure and Government Intervention The following is the demand and supply quantities for Firm X at different price points. Price (cost per unit) (in ) Quantity demanded (in thousands) Quantity supplied (pre-environment tax) (in thousands) Quantity supplied (post-environment tax) (in thousands) 10 750 350 325 15 675 400 375 20 560 475 450 25 490 515 490 30 360 570 545 How did the supply curve of Firm X react to the environment tax