Identical price changes imply equal supply elasticities

Steps:

• Compute percentage change in price for all goods: (10 - 5)/5 × 100% = 100%.
• Price elasticity of supply (Es) = (%ΔQs) / (%ΔP); with identical %ΔP, Es depends on %ΔQs.
• If each good's quantity supplied doubles (100% increase), Es = 100%/100% = 1 for all.
• Thus, all three goods have Es equal to 1.

Why A is correct:

• Es equals 1 for unit elastic supply, where %ΔQs matches %ΔP exactly, applying uniformly here per the scenario.

Why the others are wrong:

• B: Assumes varying responsiveness, but no evidence of differing %ΔQs across goods.
• C: Implies increasing elasticity without data showing progressively larger %ΔQs.
• D: Incomplete phrasing, but suggests inequality unsupported by equal price changes.

Final answer: A