Elasticity is not slope: two parallel demand curves compared (after UE Fig 8.2) Quantity Price 1 2 $4.50 $3.50 Price step $4.50 → $3.50 (%ΔP = 25.0%).Curve 1: ΔQ = 0.57 on avg Q 1.71 → %ΔQ = 33.3%.Curve 2: ΔQ = 0.57 on avg Q 3.43 → %ΔQ = 16.7%. e = 1.33 vs e = 0.67: same ΔQ, bigger base.Same slope, different elasticities.