Methods and effects of government intervention in markets — common mistakes

When drawing diagrams for taxes, always illustrate the consumer burden, producer burden, government revenue, and the deadweight loss triangle. Examiners look for a clear understanding of how the tax incidence is determined by the relative gradients (elasticities) of the demand and supply curves.

No, this is a common misconception. The burden of the tax (tax incidence) is shared between consumers and producers. The group with the more inelastic curve (demand or supply) bears a larger portion of the tax burden. Consumers only pay the full amount if demand is perfectly inelastic or supply is perfectly elastic.

Not necessarily. While subsidies lower prices and increase consumption, they represent a significant cost to the government (and taxpayers). They can also lead to allocative inefficiency by encouraging the overproduction and overconsumption of a good beyond the socially optimal level, creating a deadweight loss. Furthermore, they can protect inefficient domestic firms from more efficient foreign competition.

No. While some consumers who are able to purchase the good at the lower price benefit, the policy creates a shortage. This means many other willing consumers are unable to buy the good at all. The overall effect on total consumer surplus is ambiguous; it can increase or decrease depending on the specific elasticities and the size of the shortage. Additionally, non-price rationing mechanisms like queuing or black markets can further reduce consumer welfare.