The publisher of an economics textbook finds that, when the book's price is lowered from $70 to $60, sales rise from 10,000 to 15,000. By the midpoint method, the price elasticity of demand is:

Price elasticity of demand = 2.6

Explanation:

Given:

Old price (P0) = $70

New price (P1) = $60

Old sales (Q0) = 10,000 units

New sales (Q1) = 15,000 units

Computation of Price elasticity of demand(e):

Midpoint method

By putting the value:

e =  2.6

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