SOLVED: A simple linear demand function may be stated as Q = a - bp cr, where Q is quantity demanded. P is the product price, and r is consumer income. To compute an appropriate value for b, we can use observed values for Q and P and then set -b(Pr/Q) equal to the price elasticity of demand, O(price elasticity of supply), @income elasticity of demand, or Ocross-price elasticity of demand.

Change in Demand vs. Change in Quantity Demanded | Marginal Revolution University

Quantity Demanded Definition, Change & Examples