Answer:
The elasticity of the market demand curve between P = $6 and P = $2 (dropping all minus signs) is 1.
Explanation:
Elasticity of demand = [(6 - 2)/(6 + 2)/2]/[(2 - 6)/(2 + 6)/2]
                 = 1
Therefore, The elasticity of the market demand curve between P = $6 and P = $2 (dropping all minus signs) is 1.