Choose the intervention you would like to study from the drop-down list. You can choose between a quota, a price ceiling, a per-unit subsidy, or a per-unit tax.

Change the value of the quota/price ceiling/subsidy/tax. The graph will automatically display the consumer surplus in green, the producer surplus in blue, and the government surplus (if any) in orange. In the specific case of a subsidy, the deadweight loss will be displayed in red.