← Market equilibrium
Elasticity and who bears an intervention's impact
This is the recurring "compare elastic vs inelastic" Excellence task — the same intervention has a genuinely different effect on surplus and revenue depending on elasticity.| Measure | Inelastic demand | Elastic demand |
|---|---|---|
| Fall in quantity traded | Small — consumers keep buying nearly as much | Large — consumers switch away easily |
| Consumer surplus lost | Larger — consumers bear most of the tax/tariff | Smaller — consumers avoid much of the burden by reducing quantity |
| Government revenue (tax/tariff) | Higher — more units still traded at the higher price | Lower — fewer units traded to collect revenue from |
| Deadweight loss | Smaller relative to revenue raised | Larger relative to revenue raised — more mutually-beneficial trades are lost |
This is why governments raising revenue (e.g. excise tax) target INELASTIC goods, while removing a tariff for efficiency gains matters more on ELASTIC goods — the 2022 paper's own reasoning.
✕Assuming elasticity only affects the size of the price change
Elasticity changes FOUR things at once — the quantity response, the split of the burden between consumers and producers, the government revenue collected, and the size of the deadweight loss — not just how much the price moves. A strong "compare and contrast" answer addresses more than one of these explicitly.The efficiency-gain rule for removing a distortion
- Removing a tax/tariff/quota ALWAYS improves allocative efficiency, regardless of elasticity — it moves quantity back toward where marginal benefit = marginal cost.
- The SIZE of that efficiency gain is LARGER the more elastic the good — a bigger quantity response recovers more of the previously-lost deadweight loss.