The elasticities of supply and demand are important in determining the distribution of tax burden because they

Question

BlackTom AI · Accepted Answer

Elasticity measures the responsiveness of quantity demanded or supplied to a change in price, so it determines how the economic burden of a tax is shared between buyers and sellers.

1) Relevant knowledge points and concepts
- Price elasticity of demand (|Ed|) = percent change in quantity demanded / percent change in price; price elasticity of supply (Es) = percent change in quantity supplied / percent change in price.
- Tax incidence (economic burden) depends on relative elasticities, not on who legally remits the tax. The more inelastic side (less responsive) cannot easily change quantity and therefore absorbs a larger share of the tax burden.

2) Step-by-step reasoning
- Imposing a per-unit tax effectively shifts the supply (if levied on sellers) or demand (if levied on buyers) curve by the tax amount.
- Market adjusts to a new equilibrium; the division of the tax between higher consumer price and lower producer net price depends on how quantity responds on each side.
- Algebraic rule (for a small per-unit tax): share of tax borne by consumers ≈ Es / (Es + |Ed|); share borne by producers ≈ |Ed| / (Es + |Ed|). This shows the burden is a function of elasticities.

3) Example calculation
- Suppose Es = 0.5 (inelastic supply) and |Ed| = 1.5 (more elastic demand). Consumers’ share = 0.5 / (0.5 + 1.5) = 0.25 (25%); producers’ share = 1.5 / 2.0 = 0.75 (75%). The inelastic side (producers) bears more of the tax.

4) Why the correct answer is correct
- Option (d) directly defines elasticity as responsiveness to price changes; because tax incidence depends on responsiveness, elasticity is the key determinant of how the tax burden is distributed.

5) Why other options are incorrect
- (a) describes willingness to pay or required revenue, not responsiveness (elasticity).
- (b) refers to statutory/legal incidence (who remits payment), which does not determine economic incidence.
- (c) is misleading: who actually pays out of pocket (legal payer) can differ from who bears the economic burden; elasticity determines the latter.

Conclusion: The correct answer is d. It accurately identifies that elasticities measure responsiveness to price changes, which determines tax burden distribution.

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