A per-unit tax generates $400 in government revenue and a deadweight loss triangle worth $60. A student argues that total welfare loss from the tax is $460. What is wrong with this analysis?
ANothing — all money paid in taxes plus any deadweight loss constitutes welfare reduction
BThe government revenue is a transfer, not a destruction of value; only the $60 deadweight loss is a welfare loss
CThe deadweight loss should be added to consumer surplus loss, not government revenue
DGovernment revenue reduces deadweight loss, so the true loss is $400 − $60 = $340
Government revenue from a tax is a transfer of surplus from buyers and sellers to the government — value is redistributed, not destroyed. Only the deadweight loss triangle represents trades that would have been mutually beneficial but no longer occur because of the tax wedge. Those foregone trades destroy value that no party receives. The welfare cost of the tax is the $60 in deadweight loss, not the $460. Counting revenue as a loss is the most common welfare analysis error.
Question 2 Multiple Choice
Under perfect price discrimination, what happens to total surplus and consumer surplus compared to competitive equilibrium?
ATotal surplus falls and consumer surplus rises — the monopolist is less efficient but buyers benefit
BTotal surplus stays the same as competitive equilibrium and consumer surplus stays the same
CTotal surplus equals competitive equilibrium (no deadweight loss) but consumer surplus falls to zero
DTotal surplus rises above competitive equilibrium because the monopolist serves more customers
Under perfect price discrimination, the monopolist charges each buyer their exact willingness to pay, so every buyer who values the good above marginal cost makes a purchase. This eliminates the deadweight loss that regular monopoly creates (by restricting output). Total surplus equals the competitive equilibrium level — efficient. But the monopolist captures ALL of it: every unit of consumer surplus is transferred to the firm as profit. Consumer surplus falls to zero while total surplus is preserved. This illustrates that efficiency and equity are completely independent criteria.
Question 3 True / False
An allocation can be Pareto efficient even if one person receives all goods and everyone else receives nothing.
TTrue
FFalse
Answer: True
Pareto efficiency only requires that no reallocation could make someone better off without making someone else worse off. If one person has everything, any redistribution to others would reduce that person's welfare — so the allocation is Pareto efficient by definition. This is the core reason economists separate the efficiency criterion (is total surplus maximized?) from the equity criterion (how is surplus distributed?). Efficiency is about the size of the pie; equity is about how it is sliced.
Question 4 True / False
Government tax revenue from a per-unit tax represents deadweight loss because it permanently reduces the surplus available to consumers and producers.
TTrue
FFalse
Answer: False
Tax revenue is a transfer, not a destruction of surplus. It moves value from buyers and sellers to the government, which can spend it, redistribute it, or use it to fund public goods. The total surplus redistributed via tax revenue is still 'in the economy.' Deadweight loss, by contrast, is the value of mutually beneficial trades that no longer happen at all — a wedge between buyers' willingness to pay and sellers' willingness to accept that is not captured by anyone. Deadweight loss is destroyed value; tax revenue is redirected value.
Question 5 Short Answer
Why is government tax revenue NOT considered deadweight loss, and what exactly IS deadweight loss in the context of a per-unit tax?
Think about your answer, then reveal below.
Model answer: Tax revenue is a transfer: buyers pay more and sellers receive less, but the difference flows to the government rather than disappearing. No value is destroyed — it changes hands. Deadweight loss is the value of trades that would have occurred at the competitive price but do not occur because the tax drives a wedge between the buyer's price and the seller's price. These are transactions where willingness to pay exceeds marginal cost, but the tax gap prevents the exchange. The value that those trades would have created is lost to everyone — it is neither collected as revenue nor enjoyed as consumer/producer surplus.
Graphically, tax revenue is the rectangle between the buyer's price and seller's price over the quantity actually traded. Deadweight loss is the triangle between the demand and supply curves over the units that are no longer traded. These are distinct areas representing distinct phenomena: redistributed value versus destroyed value.