decreasing as one moves from left to right, from 28.6% to 22.2% to 18.2%, because the quantity points in each

percentage calculation are getting increasingly larger, which expands the denominator in the elasticity

calculation of the percentage change in quantity.

Consider the price changes moving up the supply curve in Figure 5.7. From points D to E to F and to G on the

supply curve, each step of $1.50 is the same in absolute value. However, if we measure the price changes in

percentage change terms, using the midpoint method, they are also decreasing, from 28.6% to 22.2% to

18.2%, because the original price points in each percentage calculation are getting increasingly larger in value,

increasing the denominator in the calculation of the percentage change in price. Along the constant unitary

elasticity supply curve, the percentage quantity increases on the horizontal axis exactly match the percentage
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